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Fix Unity Freezes After Login In Ubuntu 14.04 [Quick Tip]
================================================================================
If you upgraded Ubuntu 13.10 to Ubuntu 14.04, you might end up with **Unity freezing at login time**. You boot in to Ubuntu 14.04, enter your credential and the system just hangs up, freezes. If you are lucky, you might see mouse cursor, background wallpaper but nothing else. **No Unity launcher, no top panel** etc. Basically you will have Ubuntu in an unusable state.
This problem of missing Unity launcher, panel and system freeze can be solved by re-installing Unity. Let’s see how to do that:
### Reinstall Unity in Ubuntu 14.04 to fix system freeze issue ###
Well, since you are stuck with a frozen system, use **Ctrl+Alt+F2** key. This will take you to command line interface (instead of the default graphical user interface). You will be asked to enter your credentials. After you enter your username and password, use the following commands one by one to reinstall Unity desktop.
sudo apt-get update
sudo apt-get install –reinstall ubuntu-desktop
sudo apt-get install unity
sudo shutdown -r now
The last command will reboot your system. After the reboot, you should have Unity working as normal.
### Fixing Unity freeze issue with Nvidia graphics: ###
I don’t have experience with Nvidia graphics but I found some people mentioning additional steps for system with Nvidia graphics card. While the above trick worked for my system, I cannot verify the one below. People with Nvidia graphics, please confirm that the steps below work for your system:
Press Ctrl+Alt+F2 to use command line. And after entering username and password, use the following commands one by one:
sudo apt-get update
sudo apt-get install –reinstall ubuntu-desktop
sudo apt-get install unity
sudo apt-get remove –purge nvidia*
sudo shutdown -r now
Once you have Unity back to normal at next reboot, just reinstall the Nvidia drivers (you had just removed them).
I hope these quick tips help you to recover your Ubuntu 14.04 from a frozen Unity to a working Unity. Any questions or suggestions are always welcomed.
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via: http://itsfoss.com/fix-unity-freezes-after-login-ubuntu-14-04/
译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出

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解决Ubuntu 14.04 Unity桌面环境登陆后卡机情况的
================================================================================
如果你把Ubuntu从13.10更新到14.04,就会出现**用Unity桌面环境登陆时卡机的现象**.如果进入Ubuntu14.04的boot,并且验证进入后,系统也会挂断,并且卡机.如果你足够幸运,你可能会看到仅有的鼠标或者桌面背景.**没有Unity触发器,不存在顶部面板**等等.基本上你的ubuntu已经处于一种不稳定的状态了.
缺少Unity触发器和面板以及系统卡机的问题,需要通过重新下载Unity来解决.让我们看看怎么做:
### 重新下载Unity 解决系统卡机的问题###
好吧,既然你整纠结于一个完全冻结了的系统.按下**Ctrl+Alt+F2**.这会让你进入一个命令行接口而不是默认的用户桌面接口.切换到命令行接口后,输入用户名和密码登陆之后,使用下面的命令重装Unity桌面环境:
sudo apt-get update
sudo apt-get install –reinstall ubuntu-desktop
sudo apt-get install unity
sudo shutdown -r now
最后一个命令是重启系统,重启之后,你的Unity就完好如初了.
### 解决Nvidia显卡的Unity卡机问题###
我没有解决这个问题的经验,但是我找到了别人解决这个问题的方法.尽管上面的技巧对我来说有效,但是我不验证下面的命令.Nvidia的用户需要确认下面的步奏:
和上面一样使用**Ctrl+Alt+F2**登陆到命令行接口,输入下面的命令:
sudo apt-get update
sudo apt-get install –reinstall ubuntu-desktop
sudo apt-get install unity
sudo apt-get remove –purge nvidia*
sudo shutdown -r now
如果重启之后Unity恢复了,记得重新安装你的Nvidia显卡的驱动,因为你已经卸载了它.
我希望这些技巧能够帮助你恢复14.04的unbuntu.最后任何的问题和建议都欢迎来提.
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via: http://itsfoss.com/fix-unity-freezes-after-login-ubuntu-14-04/
译者：[ggaaooppeenngg](https://github.com/ggaaooppeenngg) 校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出