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As of right now, I create a brand new Google virtual machine. I upgraded the OS from Debian 9 (Jessie) to Debian 10 (Buster). For whatever reason, I cannot use superuser. Whenever I try, I get the error: su: Permission denied. The file permissions for /bin/su are

-rwsr-xr-x 1 root root 63K Jan 10 2019 su

The groups my user (Lunar) is in, are:

root sudo developers lunar

I also tried doing sudo adduser lunar wheel, although the group did not exist beforehand, and is not appearing in the groups above. I am SSH-ing into the computer, and I've tried the commands:

su
su -
su root

Each above the above commands have been executed with and without sudo. Any suggestions?

Edit: After further testing, I cannot su into ANY user, including my own account.

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  • Check with strace what file it doesn't have permission to read. – arved Jul 24 '19 at 15:04
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I've never heard of this happening with Debian 10, but somethimes with macOS you have to run

sudo su

to get it to work.

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