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restore sudo privilege without knowing sudo account

cv flag

I always access to a test server using an account. But I has done some mess and now the user is no more a root user. I can restore privileges without knowing root credential? How can i solve (at last I can ask after the holidays week).

user535733 avatar
cn flag
If local to the machine, try using GRUB's "recovery mode" option(s) to reach a root shell.
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