直到昨天，Ubuntu GNOME 13.04 和 gnome3-team ppa 的 GNOME 3.8 上的一切都运行正常。
今天又无法登录了，开机后卡在GDM的蓝色桌面上，什么反应都没有。
我刚刚重新安装了 Ubuntu GNOME，保留了我的主文件夹，问题再次出现。请注意，这次我没有安装任何第三方 PPA。
从哪里开始寻找此问题的解决方案？
/var/log/boot.log除了“saned”被禁用导致的某种问题外，一切看起来都很好。
我在系统日志中发现了一些错误
Apr 23 20:52:14 marc-linux bluetoothd[960]: Bluetooth daemon 4.101
Apr 23 20:52:14 marc-linux bluetoothd[960]: Starting SDP server
Apr 23 20:52:14 marc-linux modem-manager[957]: <info> ModemManager (version 0.6.0.0) starting...
Apr 23 20:52:14 marc-linux kernel: [ 13.070853] Bluetooth: Core ver 2.16
Apr 23 20:52:14 marc-linux kernel: [ 13.070874] NET: Registered protocol family 31
Apr 23 20:52:14 marc-linux kernel: [ 13.070876] Bluetooth: HCI device and connection manager initialized
Apr 23 20:52:14 marc-linux kernel: [ 13.070884] Bluetooth: HCI socket layer initialized
Apr 23 20:52:14 marc-linux kernel: [ 13.070886] Bluetooth: L2CAP socket layer initialized
Apr 23 20:52:14 marc-linux kernel: [ 13.070891] Bluetooth: SCO socket layer initialized
Apr 23 20:52:14 marc-linux kernel: [ 13.111811] Bluetooth: RFCOMM TTY layer initialized
Apr 23 20:52:14 marc-linux kernel: [ 13.111823] Bluetooth: RFCOMM socket layer initialized
Apr 23 20:52:14 marc-linux kernel: [ 13.111825] Bluetooth: RFCOMM ver 1.11
Apr 23 20:52:14 marc-linux bluetoothd[960]: DIS cannot start: GATT is disabled
Apr 23 20:52:14 marc-linux bluetoothd[960]: Failed to init deviceinfo plugin
Apr 23 20:52:14 marc-linux bluetoothd[960]: Failed to init proximity plugin
Apr 23 20:52:14 marc-linux bluetoothd[960]: Failed to init time plugin
Apr 23 20:52:14 marc-linux bluetoothd[960]: Failed to init alert plugin
Apr 23 20:52:14 marc-linux bluetoothd[960]: Failed to init thermometer plugin
Apr 23 20:52:14 marc-linux avahi-daemon[975]: Found user 'avahi' (UID 110) and group 'avahi' (GID 116).
Apr 23 20:52:14 marc-linux avahi-daemon[975]: Successfully dropped root privileges.
Apr 23 20:52:14 marc-linux avahi-daemon[975]: avahi-daemon 0.6.31 starting up.
Apr 23 20:52:15 marc-linux avahi-daemon[975]: Successfully called chroot().
Apr 23 20:52:15 marc-linux avahi-daemon[975]: Successfully dropped remaining capabilities.
Apr 23 20:52:15 marc-linux avahi-daemon[975]: Loading service file /services/udisks.service.
Apr 23 20:52:15 marc-linux kernel: [ 13.231022] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Apr 23 20:52:15 marc-linux kernel: [ 13.231026] Bluetooth: BNEP filters: protocol multicast
Apr 23 20:52:15 marc-linux kernel: [ 13.231035] Bluetooth: BNEP socket layer initialized
Apr 23 20:52:15 marc-linux avahi-daemon[975]: Network interface enumeration completed.
Apr 23 20:52:15 marc-linux avahi-daemon[975]: Registering HINFO record with values 'X86_64'/'LINUX'.
Apr 23 20:52:15 marc-linux avahi-daemon[975]: Server startup complete. Host name is marc-linux.local. Local service cookie is 2532208128.
Apr 23 20:52:15 marc-linux avahi-daemon[975]: Service "marc-linux" (/services/udisks.service) successfully established.
Apr 23 20:52:15 marc-linux kernel: [ 13.301071] ppdev: user-space parallel port driver
Apr 23 20:52:15 marc-linux bluetoothd[960]: Failed to init gatt_example plugin
Apr 23 20:52:15 marc-linux bluetoothd[960]: Bluetooth Management interface initialized
Apr 23 20:52:15 marc-linux kernel: [ 13.460244] type=1400 audit(1366761135.314:8): apparmor="STATUS" operation="profile_load" name="/usr/lib/cups/backend/cups-pdf" pid=998 comm="apparmor_parser"
Apr 23 20:52:15 marc-linux kernel: [ 13.460711] type=1400 audit(1366761135.314:9): apparmor="STATUS" operation="profile_load" name="/usr/sbin/cupsd" pid=998 comm="apparmor_parser"
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'AnyData'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Gobi'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Wavecom'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Linktop'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Novatel'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Ericsson MBM'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Option'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'SimTech'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'MotoC'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Longcheer'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Nokia'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Option High-Speed'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Huawei'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'X22X'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'ZTE'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Samsung'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Sierra'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Iridium'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Cinterion'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Loaded plugin 'Generic'
Apr 23 20:52:15 marc-linux modem-manager[957]: <info> Successfully loaded 20 plugins
Apr 23 20:52:15 marc-linux NetworkManager[1002]: <info> NetworkManager (version 0.9.8.0) is starting...
Apr 23 20:52:15 marc-linux NetworkManager[1002]: <info> Read config file /etc/NetworkManager/NetworkManager.conf
Apr 23 20:52:15 marc-linux NetworkManager[1002]: <info> WEXT support is enabled
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> VPN: loaded org.freedesktop.NetworkManager.pptp
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> DNS: loaded plugin dnsmasq
Apr 23 20:52:16 marc-linux dbus[946]: [system] Activating service name='org.freedesktop.PolicyKit1' (using servicehelper)
Apr 23 20:52:16 marc-linux polkitd[1007]: started daemon version 0.105 using authority implementation `local' version `0.105'
Apr 23 20:52:16 marc-linux dbus[946]: [system] Successfully activated service 'org.freedesktop.PolicyKit1'
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPlugin-Ifupdown: init!
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPlugin-Ifupdown: update_system_hostname
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPluginIfupdown: management mode: unmanaged
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:07.0/net/eth0, iface: eth0)
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:07.0/net/eth0, iface: eth0): no ifupdown configuration found.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/lo, iface: lo)
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/lo, iface: lo): no ifupdown configuration found.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPlugin-Ifupdown: end _init.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Loaded plugin ifupdown: (C) 2008 Canonical Ltd. To report bugs please use the NetworkManager mailing list.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Loaded plugin keyfile: (c) 2007 - 2010 Red Hat, Inc. To report bugs please use the NetworkManager mailing list.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: Ifupdown: get unmanaged devices count: 0
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPlugin-Ifupdown: (15700144) ... get_connections.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: SCPlugin-Ifupdown: (15700144) ... get_connections (managed=false): return empty list.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: Ifupdown: get unmanaged devices count: 0
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> modem-manager is now available
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> monitoring kernel firmware directory '/lib/firmware'.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> WiFi hardware radio set enabled
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> WiFi enabled by radio killswitch; enabled by state file
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> WWAN enabled by radio killswitch; enabled by state file
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> WiMAX enabled by radio killswitch; enabled by state file
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Networking is enabled by state file
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <warn> failed to allocate link cache: (-10) Operation not supported
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): carrier is OFF
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): new Ethernet device (driver: 'forcedeth' ifindex: 2)
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): bringing up device.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): carrier now ON (device state 20)
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): preparing device.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): deactivating device (reason 'managed') [2]
Apr 23 20:52:16 marc-linux kernel: [ 14.588355] forcedeth 0000:00:07.0: irq 43 for MSI/MSI-X
Apr 23 20:52:16 marc-linux kernel: [ 14.588386] forcedeth 0000:00:07.0 eth0: MSI enabled
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Added default wired connection 'Wired connection 1' for /sys/devices/pci0000:00/0000:00:07.0/net/eth0
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <warn> /sys/devices/virtual/net/lo: couldn't determine device driver; ignoring...
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <warn> /sys/devices/virtual/net/lo: couldn't determine device driver; ignoring...
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Auto-activating connection 'Wired connection 1'.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) starting connection 'Wired connection 1'
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) scheduled...
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) started...
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) scheduled...
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) complete.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) starting...
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): device state change: prepare -> config (reason 'none') [40 50 0]
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) successful.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) complete.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) started...
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): device state change: config -> ip-config (reason 'none') [50 70 0]
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Beginning DHCPv4 transaction (timeout in 45 seconds)
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> dhclient started with pid 1013
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Beginning IP6 addrconf.
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) complete.
Apr 23 20:52:16 marc-linux dhclient: Internet Systems Consortium DHCP Client 4.2.4
Apr 23 20:52:16 marc-linux dhclient: Copyright 2004-2012 Internet Systems Consortium.
Apr 23 20:52:16 marc-linux dhclient: All rights reserved.
Apr 23 20:52:16 marc-linux dhclient: For info, please visit https://www.isc.org/software/dhcp/
Apr 23 20:52:16 marc-linux dhclient:
Apr 23 20:52:16 marc-linux NetworkManager[1002]: <info> (eth0): DHCPv4 state changed nbi -> preinit
Apr 23 20:52:16 marc-linux dhclient: Listening on LPF/eth0/00:26:2d:35:b9:04
Apr 23 20:52:16 marc-linux dhclient: Sending on LPF/eth0/00:26:2d:35:b9:04
Apr 23 20:52:16 marc-linux dhclient: Sending on Socket/fallback
Apr 23 20:52:16 marc-linux dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0xfc93b5d)
Apr 23 20:52:17 marc-linux kernel: [ 15.366752] type=1400 audit(1366761137.222:10): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=1037 comm="apparmor_parser"
Apr 23 20:52:17 marc-linux kernel: [ 15.367185] type=1400 audit(1366761137.222:11): apparmor="STATUS" operation="profile_replace" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=1037 comm="apparmor_parser"
Apr 23 20:52:17 marc-linux kernel: [ 15.367439] type=1400 audit(1366761137.222:12): apparmor="STATUS" operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" pid=1037 comm="apparmor_parser"
Apr 23 20:52:17 marc-linux kernel: [ 15.389737] type=1400 audit(1366761137.246:13): apparmor="STATUS" operation="profile_load" name="/usr/lib/telepathy/mission-control-5" pid=1040 comm="apparmor_parser"
Apr 23 20:52:17 marc-linux kernel: [ 15.390275] type=1400 audit(1366761137.246:14): apparmor="STATUS" operation="profile_load" name="/usr/lib/telepathy/telepathy-*" pid=1040 comm="apparmor_parser"
Apr 23 20:52:17 marc-linux kernel: [ 15.391104] type=1400 audit(1366761137.246:15): apparmor="STATUS" operation="profile_load" name="/usr/lib/telepathy/telepathy-*//sanitized_helper" pid=1040 comm="apparmor_parser"
Apr 23 20:52:17 marc-linux kernel: [ 15.394550] type=1400 audit(1366761137.250:16): apparmor="STATUS" operation="profile_replace" name="/usr/lib/cups/backend/cups-pdf" pid=1041 comm="apparmor_parser"
Apr 23 20:52:17 marc-linux kernel: [ 15.395051] type=1400 audit(1366761137.250:17): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/cupsd" pid=1041 comm="apparmor_parser"
Apr 23 20:52:17 marc-linux anacron[1095]: Anacron 2.3 started on 2013-04-23
Apr 23 20:52:17 marc-linux acpid: starting up with proc fs
Apr 23 20:52:17 marc-linux cron[1078]: (CRON) INFO (pidfile fd = 3)
Apr 23 20:52:17 marc-linux anacron[1095]: Will run job `cron.daily' in 5 min.
Apr 23 20:52:17 marc-linux anacron[1095]: Will run job `cron.weekly' in 10 min.
Apr 23 20:52:17 marc-linux anacron[1095]: Will run job `cron.monthly' in 15 min.
Apr 23 20:52:17 marc-linux anacron[1095]: Jobs will be executed sequentially
Apr 23 20:52:17 marc-linux cron[1114]: (CRON) STARTUP (fork ok)
Apr 23 20:52:17 marc-linux cron[1114]: (CRON) INFO (Running @reboot jobs)
Apr 23 20:52:18 marc-linux avahi-daemon[975]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::226:2dff:fe35:b904.
Apr 23 20:52:18 marc-linux avahi-daemon[975]: New relevant interface eth0.IPv6 for mDNS.
Apr 23 20:52:18 marc-linux avahi-daemon[975]: Registering new address record for fe80::226:2dff:fe35:b904 on eth0.*.
Apr 23 20:52:18 marc-linux acpid: 33 rules loaded
Apr 23 20:52:18 marc-linux acpid: waiting for events: event logging is off
Apr 23 20:52:18 marc-linux acpid: client connected from 1265[0:0]
Apr 23 20:52:18 marc-linux acpid: 1 client rule loaded
Apr 23 20:52:19 marc-linux dhclient: DHCPREQUEST of 192.168.25.7 on eth0 to 255.255.255.255 port 67 (xid=0xfc93b5d)
Apr 23 20:52:19 marc-linux dhclient: DHCPOFFER of 192.168.25.7 from 192.168.25.1
Apr 23 20:52:19 marc-linux dhclient: DHCPACK of 192.168.25.7 from 192.168.25.1
Apr 23 20:52:19 marc-linux NetworkManager[1002]: <info> (eth0): DHCPv4 state changed preinit -> bound
Apr 23 20:52:19 marc-linux NetworkManager[1002]: <info> address 192.168.25.7
Apr 23 20:52:19 marc-linux NetworkManager[1002]: <info> prefix 24 (255.255.255.0)
Apr 23 20:52:19 marc-linux NetworkManager[1002]: <info> gateway 192.168.25.1
Apr 23 20:52:19 marc-linux NetworkManager[1002]: <info> hostname 'marc-linux'
Apr 23 20:52:19 marc-linux NetworkManager[1002]: <info> nameserver '192.168.25.1'
Apr 23 20:52:19 marc-linux NetworkManager[1002]: <info> domain name 'home'
Apr 23 20:52:19 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Configure Commit) scheduled...
Apr 23 20:52:19 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) started...
Apr 23 20:52:19 marc-linux avahi-daemon[975]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.25.7.
Apr 23 20:52:19 marc-linux avahi-daemon[975]: New relevant interface eth0.IPv4 for mDNS.
Apr 23 20:52:19 marc-linux avahi-daemon[975]: Registering new address record for 192.168.25.7 on eth0.IPv4.
Apr 23 20:52:19 marc-linux dhclient: bound to 192.168.25.7 -- renewal in 39834 seconds.
Apr 23 20:52:19 marc-linux gdm-simple-slave[1168]: WARNING: Failed to give slave programs access to the display. Trying to proceed.
Apr 23 20:52:19 marc-linux dbus[946]: [system] Activating service name='org.freedesktop.Accounts' (using servicehelper)
Apr 23 20:52:19 marc-linux accounts-daemon[1297]: started daemon version 0.6.29
Apr 23 20:52:19 marc-linux dbus[946]: [system] Successfully activated service 'org.freedesktop.Accounts'
Apr 23 20:52:19 marc-linux dbus[946]: [system] Activating service name='org.freedesktop.ConsoleKit' (using servicehelper)
Apr 23 20:52:19 marc-linux dbus[946]: [system] Successfully activated service 'org.freedesktop.ConsoleKit'
Apr 23 20:52:20 marc-linux gdm-launch-environment][1294]: GLib-CRITICAL: g_variant_compare: assertion `!g_variant_is_container (a)' failed
Apr 23 20:52:20 marc-linux gdm-launch-environment][1294]: GLib-CRITICAL: g_variant_compare: assertion `!g_variant_is_container (a)' failed
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <info> (eth0): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) complete.
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <info> (eth0): device state change: secondaries -> activated (reason 'none') [90 100 0]
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS.
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <info> DNS: starting dnsmasq...
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <warn> dnsmasq not available on the bus, can't update servers.
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <error> [1366761140.496992] [nm-dns-dnsmasq.c:402] update(): dnsmasq owner not found on bus: Could not get owner of name 'org.freedesktop.NetworkManager.dnsmasq': no such name
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <warn> DNS: plugin dnsmasq update failed
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <info> Writing DNS information to /sbin/resolvconf
Apr 23 20:52:20 marc-linux dnsmasq[1429]: started, version 2.65 cache disabled
Apr 23 20:52:20 marc-linux dnsmasq[1429]: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack
Apr 23 20:52:20 marc-linux dnsmasq[1429]: DBus support enabled: connected to system bus
Apr 23 20:52:20 marc-linux dnsmasq[1429]: warning: no upstream servers configured
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <info> Activation (eth0) successful, device activated.
Apr 23 20:52:20 marc-linux dbus[946]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <warn> dnsmasq appeared on DBus: :1.20
Apr 23 20:52:20 marc-linux NetworkManager[1002]: <info> Writing DNS information to /sbin/resolvconf
Apr 23 20:52:20 marc-linux dnsmasq[1429]: setting upstream servers from DBus
Apr 23 20:52:20 marc-linux dnsmasq[1429]: using nameserver 192.168.25.1#53
Apr 23 20:52:20 marc-linux dbus[946]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Apr 23 20:52:22 marc-linux dbus[946]: [system] Activating service name='org.freedesktop.UPower' (using servicehelper)
Apr 23 20:52:22 marc-linux dbus[946]: [system] Successfully activated service 'org.freedesktop.UPower'
Apr 23 20:52:23 marc-linux gdm-launch-environment][1294]: GLib-CRITICAL: g_variant_compare: assertion `!g_variant_is_container (a)' failed
Apr 23 20:52:23 marc-linux gdm-launch-environment][1294]: GLib-CRITICAL: g_variant_compare: assertion `!g_variant_is_container (a)' failed
Apr 23 20:52:23 marc-linux dbus[946]: [system] Activating service name='org.freedesktop.RealtimeKit1' (using servicehelper)
Apr 23 20:52:23 marc-linux dbus[946]: [system] Successfully activated service 'org.freedesktop.RealtimeKit1'
Apr 23 20:52:23 marc-linux rtkit-daemon[1746]: Successfully called chroot.
Apr 23 20:52:23 marc-linux rtkit-daemon[1746]: Successfully dropped privileges.
Apr 23 20:52:23 marc-linux rtkit-daemon[1746]: Successfully limited resources.
Apr 23 20:52:23 marc-linux rtkit-daemon[1746]: Running.
Apr 23 20:52:23 marc-linux rtkit-daemon[1746]: Watchdog thread running.
Apr 23 20:52:23 marc-linux rtkit-daemon[1746]: Canary thread running.
Apr 23 20:52:23 marc-linux rtkit-daemon[1746]: Successfully made thread 1744 of process 1744 (n/a) owned by '114' high priority at nice level -11.
Apr 23 20:52:23 marc-linux rtkit-daemon[1746]: Supervising 1 threads of 1 processes of 1 users.
Apr 23 20:52:24 marc-linux rtkit-daemon[1746]: Successfully made thread 1753 of process 1744 (n/a) owned by '114' RT at priority 5.
Apr 23 20:52:24 marc-linux rtkit-daemon[1746]: Supervising 2 threads of 1 processes of 1 users.
Apr 23 20:52:24 marc-linux rtkit-daemon[1746]: Successfully made thread 1754 of process 1744 (n/a) owned by '114' RT at priority 5.
Apr 23 20:52:24 marc-linux rtkit-daemon[1746]: Supervising 3 threads of 1 processes of 1 users.
Apr 23 20:52:24 marc-linux rtkit-daemon[1746]: Successfully made thread 1755 of process 1744 (n/a) owned by '114' RT at priority 5.
Apr 23 20:52:24 marc-linux rtkit-daemon[1746]: Supervising 4 threads of 1 processes of 1 users.
Apr 23 20:52:24 marc-linux rtkit-daemon[1746]: Successfully made thread 1757 of process 1757 (n/a) owned by '114' high priority at nice level -11.
Apr 23 20:52:24 marc-linux rtkit-daemon[1746]: Supervising 5 threads of 2 processes of 1 users.
Apr 23 20:52:24 marc-linux pulseaudio[1757]: [pulseaudio] pid.c: Daemon already running.
Apr 23 20:52:25 marc-linux dbus[946]: [system] Activating service name='org.freedesktop.UDisks2' (using servicehelper)
Apr 23 20:52:25 marc-linux udisksd[1766]: udisks daemon version 2.1.0 starting
Apr 23 20:52:25 marc-linux dbus[946]: [system] Successfully activated service 'org.freedesktop.UDisks2'
Apr 23 20:52:25 marc-linux udisksd[1766]: Acquired the name org.freedesktop.UDisks2 on the system message bus
Apr 23 20:52:26 marc-linux gnome-session[1424]: WARNING: Detected that screensaver has left the bus
Apr 23 20:52:27 marc-linux gnome-session[1424]: WARNING: Detected that screensaver has left the bus
Apr 23 20:52:27 marc-linux gnome-session[1424]: WARNING: App 'gnome-shell.desktop' respawning too quickly
Apr 23 20:52:27 marc-linux gnome-session[1424]: CRITICAL: We failed, but the fail whale is dead. Sorry....
Apr 23 20:52:29 marc-linux ntpdate[1553]: adjust time server 91.189.94.4 offset -0.339355 sec
Apr 23 20:52:36 marc-linux NetworkManager[1002]: <info> (eth0): IP6 addrconf timed out or failed.
Apr 23 20:52:36 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
Apr 23 20:52:36 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) started...
Apr 23 20:52:36 marc-linux NetworkManager[1002]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
Apr 23 20:57:17 marc-linux anacron[1095]: Job `cron.daily' started
Apr 23 20:57:17 marc-linux anacron[2274]: Updated timestamp for job `cron.daily' to 2013-04-23
先感谢您。
答案1
sudo apt-get dist-upgrade我也犯了不使用并且无法登录的错误。
幸运的是，有一种方法可以应用完整更新而无需重新安装 Ubuntu。当您重新启动计算机并且您认为启动过程已完成时，请按Ctrl+Alt+F1。系统将提示您输入命令行。
使用您的用户名和密码登录，并确保您已连接互联网（例如ping google.com）。如果您的 WiFi 不工作，请使用以太网电缆将您的计算机连接到路由器。
然后您只需输入sudo apt-get dist-upgrade，您的计算机就会下载并安装缺少的软件包。重新启动计算机，sudo shutdown -r now重新启动后，Gnome 3.8 应该可以正常工作。
答案2
sudo apt-get dist-upgrade我注意到您提到您已经安装了 gnome3 PPA。您是否确保在安装此 PPA 时使用：而不是仅使用该选项执行了更新upgrade？PPA 的发行说明中提到了这一点，如果不这样做，将导致与您描述的类似症状。