Ubuntu – Sudo hangs without prompting for password

You can use:

if sudo -n true 2>/dev/null; then 
    echo "I got sudo"
else
    echo "I don't have sudo"
fi

The -n (non-interactive) option prevents sudo from prompting the user for a password. If a password is required for the command to run, sudo will display an error message (redirected to /dev/null) and exit. If the password is not required, then this expression is true: sudo -n true 2>/dev/null.

I have the same problem, the only ""solution"" I've found is the following:

• run a sudo command
• when prompted for fingerprint, stop the fingerprint foreground check with ctrl+z
• rerun the sudo command (arrow up and enter works fine)
• it should now be "hanging" without any output
• immediately cancel with ctrl+c
• the command should now skip directly at the password input

Here is a screenshot of what it looks like:

It's still a bit annoying but at least you don't have to wait for anything to happen on its own. Hopefully, somebody will come out with a more elegant solution.