I have a linux Ubuntu laptop (16.4) that was not supporting any command starting from sudo and I have googled but not getting any solution because we don't know root user and password, so I am totally stuck.
For Example: If I want to run any command it doesn't work, like:
sudo apt-get update
And I get the error:
sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set
How can I fix it?
I don't want to format machine right now.