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sudo su useris being used to not prompt for password (I am aware of the security implications of doing this). Anyways, if I usesu userand introduce the password manually the exact same problem still rises. I have read the manuals you mentioned and used both options, unfortunately with no results. The sequence of commands used is only:sudo su userorsu user. Any other suggestions? Thanks.su -l userandsu -l rootstill reproduce the issue. I have feeling that it has to do with some kind of "user aliases" or "environment variables" as you mentioned, unfortunately I haven't found related info to test it.sudo su: if a user can usesudowithout a password, thensudo -iu usernameis the command to use. There really is no purpose invokingsudo su.id user1andid user2?USER,LOGNAMEandMAILenvironment variables are being overwritten from one another occasionally. Already tried to search for the process that generates them, with no luck.