Hi, all,

I'm running Debian 10.2 and ran apt-get update && apt-get upgrade within the past week (sorry that I don't remember the date). Today I tried to use sudo for the first time since then and I'm getting the following output in the terminal:

I've tried running echo, ls, apt-get update under sudo, but they all produce the same error message.

I can use su to log in as root so I tried updating with Apt again today to see if there was a bug that may have been fixed, but that still doesn't work.

I tried creating a new user, configuring them the same as my "normal" user from visudo and that user can use sudo just fine. The problem seems to be specific to my "normal" user.

Any ideas on how I troubleshoot this further?

in such cases you can compare the environment (variables) of the two users (for example).