I have this issue on AWS on some servers. Whenever I run sudo the terminal is stuck doing seemingly nothing, until it finally spits out this error message. My terminal looks like this:ubuntu
ubuntu@(none):~$ sudo true sudo: unable to resolve host (none)
What can I do to solve it?app
Please post the contents of /etc/hostname and /etc/hostsdom
make sure your idehostname same with hosts. e.g. the hostname is ubuntu-pc and hosts is ubuntu-pcmust be same.
wo things to check (assuming your machine is called my-machine, you can change this as appropriate):post
That the /etc/hostname file contains just the name of the machine.this
That /etc/hosts has an entry for localhost. It should have something like:spa
127.0.0.1 localhost.localdomain localhost 127.0.1.1 my-machine
If either of these files aren't correct (since you can't sudo), you may have to reboot the machine into recovery mode and make the modifications, then reboot to your usual environment.code