编译内核时，空间不足，编译失败，重启系统和出现system running in low graphic mode,Your screen,graphics card, and input device settings could not be detected correctly.You will need to configure these yourself.提示（还有其他原因会出现此提示）。
解决办法：
1.按Ctrl+Alt+F1进入命令界面，登陆系统。
2.删除最近添加的大文件。
或者：
1.Press Ctrl + Alt + F1
2.Type df
-h 查看各分区空间占用率
3.If you see that there is no space available on the root (/) then you need to free some space.
To free space you can:
1.sudo
apt-get autoclean
2.Look for large directories with sudo
du -sc /*/* |sort -g and delete unwanted content,
3.Clean your home directory using a combination of
cd ~
du -sc * |sort -g
rm myLargeFile
When this is done, restart: shutdown -r now