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I have a Debian server, and I can SSH to it.. On SSH there I'm prompted to specify username and pass, I can login here as any user I want..

If I'm root I can change to other users, for example with: "su luxo" to login on user luxo.

But if I'm logged in as another user, I can't login to root, or even other users.. It allways gives an "authentication failure" notify.

How can I solve this? If I want to change user now I have to open a new SSH session every time..

  • If you log in as user are you able to execute su (with no other parameters, typing in the password for the root user, and becoming the root user)? – PP. Jul 25 '13 at 8:47
  • Please paste the output of ls -ld `which su` into your question. – Jenny D Jul 25 '13 at 9:05
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As far as I know you can't switch from one user to another via su user - it has to be done as root user. Only way I know to do this as user is via sudo command, so it looks like

sudo su user

If you're able to access root account by doing su or su - (which automatically cd's to root $HOME) everything is ok.

  • 1
    You can use su as a normal user, but you'll be prompted for the new user's password. – Flup Jul 25 '13 at 10:01

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