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su: System Error, Cannot log in as root

lc flag

I am using Ubuntu 20.04 LTS. After installing it, the su command worked perfectly (I was able to log in), but after rebooting the system, whenever I run su, it says:

rakin@localhost:~$ su
Password:
su: System Error
rakin@localhost:~$

The user rakin doesn't have sudo access, so I am in big trouble. How can I fix this?

cc flag
The typical Ubuntu install has no root password, and the first user gets sudo access. You can of course change anything, but don't expect much help here with such odd configurations.
hr flag
I don't recognize the error (and I can't find the string `System Error` in the source code of the `util-linux` package) however you can obtain sudo access by following the instructions here: [How do I add myself \[back\] as a sudo user?](https://askubuntu.com/questions/70442/how-do-i-add-myself-back-as-a-sudo-user)

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