Здравствуйте. Возникла такая проблема: подключаюсь к удаленной машине по ssh пользователем user, далее
user@xxx:~$ su
Password:
su: Authentication failure
login as: root
root@xxxxxxx password:
Linux xxx 3.0.62+ #1 PREEMPT Sat Jun 1 18:11:34 FET 2013 armv7l
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sat Jun 29 23:00:02 2013 from xxxxxx
root@xxx:~#