I followed a tutorial on how to grant root access to other users and what I did was, in
/etc/passwd/ I changed the other users' uid/gid to
The problem is that once I block ssh access to user root by changing
PermitRootLogin to no in
sshd_config, all other users that share the
0:0 uid/gid also loose access via ssh to the box.
The box does not have internet access, so, installing sudo/sudoer to manage users it's not possible.