关闭 L2TP VPN 连接后，系统报告错误对话框。请检查日志表var/log/syslog。此外，我不确定这是否相关，但 Google Chrome 会记住 VPN 位置并保留与此位置相关的默认搜索页面（更改默认搜索引擎是 Chrome 设置修复此问题）。运行 Ubuntu 16.10。
我对 Linux 还很陌生。您知道问题的根本原因是什么吗？
Mar 27 13:25:08 ubuntu-desktop NetworkManager[1174]: <info> [1490613908.2511] manager: NetworkManager state is now CONNECTED_LOCAL
Mar 27 13:25:08 ubuntu-desktop whoopsie[1141]: [13:25:08] offline
Mar 27 13:25:08 ubuntu-desktop NetworkManager[1174]: <info> [1490613908.2556] audit: op="connection-deactivate" uuid="19df092e-18ec-4ff6-9971-2b6ab8858e25" name="kodify.io" pid=4486 uid=1000 result="success"
Mar 27 13:25:08 ubuntu-desktop NetworkManager[1174]: <info> [1490613908.2576] manager: NetworkManager state is now CONNECTED_GLOBAL
Mar 27 13:25:08 ubuntu-desktop NetworkManager[1174]: <info> [1490613908.2581] dns-mgr: Writing DNS information to /sbin/resolvconf
Mar 27 13:25:08 ubuntu-desktop dnsmasq[2229]: setting upstream servers from DBus
Mar 27 13:25:08 ubuntu-desktop dnsmasq[2229]: using nameserver 192.168.2.2#53(via wlp4s0)
Mar 27 13:25:08 ubuntu-desktop charon: 14[KNL] interface ppp1 deactivated
Mar 27 13:25:08 ubuntu-desktop dbus[1153]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
Mar 27 13:25:08 ubuntu-desktop NetworkManager[1174]: nm-l2tp[22353] <info> Terminated xl2tpd daemon with PID 22427.
Mar 27 13:25:08 ubuntu-desktop NetworkManager[1174]: xl2tpd[22427]: death_handler: Fatal signal 15 received
Mar 27 13:25:08 ubuntu-desktop charon: 15[KNL] 10.0.0.250 disappeared from ppp1
Mar 27 13:25:08 ubuntu-desktop kernel: [17163.713369] xl2tpd[22427]: segfault at 188 ip 000000000040bd08 sp 00007ffc058fdc30 error 4 in xl2tpd[400000+1b000]
Mar 27 13:25:08 ubuntu-desktop whoopsie[1141]: [13:25:08] Could not determine if /org/freedesktop/NetworkManager/ActiveConnection/3 is a default route:
Mar 27 13:25:08 ubuntu-desktop whoopsie[1141]: [13:25:08] GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.freedesktop.DBus.Properties' on object at path /org/freedesktop/NetworkManager/ActiveConnection/3
Mar 27 13:25:08 ubuntu-desktop whoopsie[1141]: [13:25:08] Could not determine if /org/freedesktop/NetworkManager/ActiveConnection/3 is a default route:
Mar 27 13:25:08 ubuntu-desktop whoopsie[1141]: [13:25:08] GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.freedesktop.DBus.Properties' on object at path /org/freedesktop/NetworkManager/ActiveConnection/3
Mar 27 13:25:08 ubuntu-desktop whoopsie[1141]: [13:25:08] The default IPv4 route is: /org/freedesktop/NetworkManager/ActiveConnection/1
Mar 27 13:25:08 ubuntu-desktop whoopsie[1141]: [13:25:08] Not a paid data plan: /org/freedesktop/NetworkManager/ActiveConnection/1
Mar 27 13:25:08 ubuntu-desktop whoopsie[1141]: [13:25:08] Found usable connection: /org/freedesktop/NetworkManager/ActiveConnection/1
Mar 27 13:25:08 ubuntu-desktop NetworkManager[1174]: <info> [1490613908.2813] vpn-connection[0x5629773fb410,19df092e-18ec-4ff6-9971-2b6ab8858e25,"kodify.io",0]: VPN plugin: state changed: stopping (5)
Mar 27 13:25:08 ubuntu-desktop NetworkManager[1174]: Stopping strongSwan IPsec...
Mar 27 13:25:08 ubuntu-desktop charon: 00[DMN] signal of type SIGINT received. Shutting down
Mar 27 13:25:08 ubuntu-desktop systemd[1]: Starting Network Manager Script Dispatcher Service...
Mar 27 13:25:08 ubuntu-desktop charon: 00[IKE] closing CHILD_SA nm-ipsec-l2tp-22353{1} with SPIs cad0eace_i (2261568 bytes) 04c825b2_o (298910 bytes) and TS 192.168.2.78/32[udp/l2f] === 81.47.131.124/32[udp/l2f]
Mar 27 13:25:08 ubuntu-desktop charon: 00[IKE] sending DELETE for ESP CHILD_SA with SPI cad0eace
Mar 27 13:25:08 ubuntu-desktop charon: 00[ENC] generating INFORMATIONAL_V1 request 1226276165 [ HASH D ]
Mar 27 13:25:08 ubuntu-desktop charon: 00[NET] sending packet: from 192.168.2.78[4500] to 81.47.131.124[4500] (76 bytes)
Mar 27 13:25:08 ubuntu-desktop charon: 00[IKE] deleting IKE_SA nm-ipsec-l2tp-22353[1] between 192.168.2.78[192.168.2.78]...81.47.131.124[81.47.131.124]
Mar 27 13:25:08 ubuntu-desktop charon: 00[IKE] sending DELETE for IKE_SA nm-ipsec-l2tp-22353[1]
Mar 27 13:25:08 ubuntu-desktop charon: 00[ENC] generating INFORMATIONAL_V1 request 804183604 [ HASH D ]
Mar 27 13:25:08 ubuntu-desktop charon: 00[NET] sending packet: from 192.168.2.78[4500] to 81.47.131.124[4500] (84 bytes)
Mar 27 13:25:08 ubuntu-desktop dbus[1153]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Mar 27 13:25:08 ubuntu-desktop systemd[1]: Started Network Manager Script Dispatcher Service.
Mar 27 13:25:08 ubuntu-desktop nm-dispatcher: req:1 'vpn-down' [ppp1]: new request (1 scripts)
Mar 27 13:25:08 ubuntu-desktop nm-dispatcher: req:1 'vpn-down' [ppp1]: start running ordered scripts...
Mar 27 13:25:08 ubuntu-desktop systemd[3603]: Starting Notification regarding a crash report...
Mar 27 13:25:08 ubuntu-desktop nm-l2tp-service[22353]: ipsec shut down
Mar 27 13:25:08 ubuntu-desktop NetworkManager[1174]: <info> [1490613908.3803] vpn-connection[0x5629773fb410,19df092e-18ec-4ff6-9971-2b6ab8858e25,"kodify.io",0]: VPN plugin: state changed: stopped (6)
Mar 27 13:25:08 ubuntu-desktop update-notifier-crash[23777]: xl2tpd
Mar 27 13:25:08 ubuntu-desktop system-crash-no[23786]: GtkDialog mapped without a transient parent. This is discouraged.
Mar 27 13:25:09 ubuntu-desktop whoopsie[1141]: [13:25:09] online
Mar 27 13:25:26 ubuntu-desktop systemd[3603]: Started Notification regarding a crash report.
答案1
@RayB 说得对。非常感谢。
但正确的命令应该是：
sudo apt-get install network-manager=1.2.2-0ubuntu0.16.04.4
sudo service network-manager restart
我希望他们能在下次升级时解决该错误。
答案2
我相信您的问题与最新版本的网络管理器中的错误有关。
降级应该可以解决此问题。您可以通过运行以下命令来执行此操作
sudo apt install network-manager=1.2.2-0ubuntu0.16.04.4
sudo service network-manager restart
更多有关错误单的信息请见此处：
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1671606