Recent update reverted /etc/sudoers (maybe?)

[HankB]

I'm running Stretch RC (AMD_64) and after updating my system (yesterday according to the date on /var/log/dpkg.log) I've lost the ability to `sudo`. I installed without a root login and use `sudo` for all administrative tasks. This morning I'm advidsed " ... is not in the sudoers file. This incident will be reported."

I'm curoius how this happened. I grepped the dpkg log for 'sudo' and found nothing. I did reboot sune time yesterday because the system was getting wonky (programs not running, desktop not responding etc.) I also rebooted when NetworkManager filled my root drive with log messages when a WiFi access point went away. (Grrr...)

Since the update I also installed Wireshark and selected to not require users to run as root. I then used the `newgrp` command as described in this post https://superuser.com/questions/272061/ ... ogging-out to add the group w/out the need to log out. Could that have caused this problem?

I can fix this pretty easily (I think) by booting a live CD and adding myself back to /etc/sudoers but I thought it worth mentioning anyway.

Thanks!

Edit:
On further investigation I found that my user ID had been removed from all groups other than wireshark in /etc/group. Apparently this is the result of executing

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sudo usermod -G wireshark hbarta

I think the correct command would have been.

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sudo usermod -a wireshark hbarta

Usually I edit /etc/group manually and perhaps I should stick with that.

[Dai_trying]

I think the correct command would be

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sudo usermod -a -G wireshark hbarta

at least that's how i do it and it hasn't failed me yet.

[cronoik]

I think the correct command would have been.

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sudo usermod -a wireshark hbarta

Just the a parameter doesn't work at all. You need the additional -G parameter like Dai_trying and the manpage suggest's.

[HankB]

Thank you both for the clarification on the correct command.