我运行了一个愚蠢的命令：sudo chown -R ngoclb:ngoclb /usr。然后我无法使用 sudo 命令并登录 Ubuntu。为了解决这个问题，我使用恢复模式将权限更改/usr为 root ( sudo chown -R root:root /usr) 并可以登录 Ubuntu，但现在，Ubuntu 的 GUI 不像默认的（对于某些组件，它与 Windows 经典相同：滚动条、菜单...）并且我无法访问系统设置/用户帐户。我该如何解决这个问题？
答案1
几乎所有东西/usr都归root:root
我find /usr -not -gid 0 -printf "%M\t%u\t%g\t%p\n"在这里使用 15.04 运行，输出是
-r-xr-sr-x root postdrop /usr/sbin/postqueue
-rwsr-xr-- root dip /usr/sbin/pppd
-r-xr-sr-x root postdrop /usr/sbin/postdrop
drwxrwsr-t root lpadmin /usr/share/ppd/custom
drwxrwsr-x root staff /usr/local/share/xml
drwxrwsr-x root staff /usr/local/share/xml/declaration
drwxrwsr-x root staff /usr/local/share/xml/entities
drwxrwsr-x root staff /usr/local/share/xml/schema
drwxrwsr-x root staff /usr/local/share/xml/misc
drwxrwsr-x root staff /usr/local/share/emacs
drwxrwsr-x root staff /usr/local/share/emacs/site-lisp
drwxrwsr-x root staff /usr/local/share/sgml
drwxrwsr-x root staff /usr/local/share/sgml/declaration
drwxrwsr-x root staff /usr/local/share/sgml/entities
drwxrwsr-x root staff /usr/local/share/sgml/dtd
drwxrwsr-x root staff /usr/local/share/sgml/stylesheet
drwxrwsr-x root staff /usr/local/share/sgml/misc
drwxrwsr-x root staff /usr/local/share/ca-certificates
drwxrwsr-x root staff /usr/local/share/fonts
drwxrwsr-x root staff /usr/local/lib/python3.4
drwxrwsr-x root staff /usr/local/lib/python3.4/dist-packages
drwxrwsr-x root staff /usr/local/lib/python2.7
drwxrwsr-x root staff /usr/local/lib/python2.7/dist-packages
drwxrwsr-x root staff /usr/local/lib/python2.7/site-packages
drwxr-xr-x root utempter /usr/lib/utempter
-rwxr-sr-x root utmp /usr/lib/utempter/utempter
-rwxr-sr-x root mail /usr/lib/evolution/camel-lock-helper-1.2
-rwsr-xr-- root messagebus /usr/lib/dbus-1.0/dbus-daemon-launch-helper
-rwxr-sr-x root utmp /usr/lib/libvte-2.91-0/gnome-pty-helper
-rwxr-sr-x root crontab /usr/bin/crontab
-rwxr-sr-x root tty /usr/bin/wall
-rwxr-sr-x root tty /usr/bin/bsd-write
-rwxr-sr-x root shadow /usr/bin/chage
-rwxr-sr-x root shadow /usr/bin/expiry
-rwxr-sr-x root mail /usr/bin/mail-unlock
-rwxr-sr-x root mlocate /usr/bin/mlocate
-rwxr-sr-x root mail /usr/bin/dotlockfile
-rwxr-sr-x root mail /usr/bin/mail-touchlock
-rwxr-sr-x root mail /usr/bin/mail-lock
-rwxr-sr-x root ssh /usr/bin/ssh-agent
-rwsr-sr-x daemon daemon /usr/bin/at
并且根据输出，我看不出你可能犯了什么错误，导致你得到你所描述的结果。可能是 dbus 的东西……
但您仍然可以手动 chown 上述文件来尝试恢复您的 ubuntu。
你可能没有相同的文件，或者我可能会错过你的一些文件，所以即使你手动chown上面的文件，你还没有完全完成。