sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set That kind of problem.   Option 1   Control + Alt + F3    log in as root  and live without sudo   Option 2   Open a terminal ssh root@127.0.0.1   and log in as root   Option 3     copy this to a file named /tmp/armbiansudo.txt   chown root:root /usr/bin/sudo chmod 4755 /usr/bin/sudo chown root:root /usr/lib/sudo/sudoers.so c