
Originally Posted by
izakter-v22
/usr/bin/sudo must be owned by user with uid 0 and setuid bit
That is a serious error. It's unrelated to installing KDE.
This can be fixed, assuming it's the only thing wrong. You have to boot in recovery mode and fix the permissions. However, in my experience, this is rarely the only thing wrong. Broken permissions on /usr/bin/sudo usually result from applying chmod or chown on all files in /usr/bin, causing such severe damage that the only realistic way forward is reinstalling. Sometimes it's the result of filesystem damage, like a broken hard drive. Let's see...
Code:
ls -l /usr/bin/sudo
ls -l /usr/bin | grep -v '^lrwxrwxrwx\|^-rwxr-xr-x'
The first command will show the permissions of sudo, which should start with
Code:
-rwsr-xr-x root root
and the second will show all files in /usr/bin that are not symlinks and don't have the most common set of permissions. It should list about 20 files.