我刚刚从 12.04 升级到 14.04。一切顺利，重启也是如此。然后，我重新激活了一些第三方软件包源，并进行了一些更新。之后，ubuntu 无法启动。屏幕上显示“ubuntu”及其下方的一些点。然后，系统冻结，我还没看到登录屏幕。在系统冻结之前，我可以通过按 CTRL+ALT+F1 进入终端环境。
我已删除所有第三方软件，并重新安装了 Unity 和桌面环境。但毫无作用。
此外，我尝试过
unity --replace
给予
WARNING: no DISPLAY variable set, setting it to :0
stop: Unknown job: unity-panel-service
start: Unknown job: unity-panel-service
compiz (core) - Info: Loading plugin: core
compiz (core) - Info: Starting plugin: core
compiz (core) - Fatal: Couldn't open display :0
compiz (core) - Info: Stopping plugin: core
compiz (core) - Info: Unloading plugin: core
sudo lspci -vnn |grep VGA -A 12
给出
VGA compatible controler [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV710/M92 [Mobility Radeon HD 4350/4550] [1002:9555] (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Device [103c:1471]
Flags: bus master, fast devsel, latency 0, IRQ 49
Memory at c0000000 (32-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=256]
Memory at d4400000 (32-bit, nonprefetchable) [size=64K]
Expansion ROM at d4420000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Kernel driver in use: radeon
Kernel modules: radeon
并尝试
startx
给出
X: cannot stat /ets/X11/X (No such file or directory), aborting
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error What does that mean?
我非常感谢任何帮助！
谢谢。