openvz:~# dpkg -l | grep vz
ii  linux-image-2.6.26-2-openvz-686          2.6.26-25                Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4, OpenVZ support
ii  linux-image-openvz-686                   2.6.26+17+lenny1         Linux image on PPro/Celeron/PII/PIII/P4, OpenVZ support
ii  vzctl                                    3.0.22-14                server virtualization solution - control tools
ii  vzquota                                  3.0.11-1                 server virtualization solution - quota tools
openvz:~# cat /etc/issue
Debian GNU/Linux 5.0 \n \l
openvz:~# cat /vz/private/777/etc/issue
Ubuntu 10.04.1 LTS \n \l

openvz:~# vzctl restart 777
Restarting VE
Stopping VE ...
VE was stopped
VE is unmounted
Starting VE ...
VE is mounted
Adding IP address(es): xxxxxxxxxx
Setting CPU units: 10000
Configure meminfo: 135168
Set hostname: xxxxxxxxx
File resolv.conf was modified
VE start in progress...
openvz:~# vzctl enter 777
enter into VE 777 failed
Unable to open pty: No such file or directory
openvz:~# vzctl exec 777 "mount -t devpts devpts /dev/pts"
openvz:~# vzctl enter 777
entered into VE 777
root@mail:/#top

   1 root      20   0  2256 1180  992 S    0  0.2   0:00.08 init                                                                                                                
   28 root      20   0  2164  468  324 S    0  0.1   0:00.00 vzctl                                                                                                               
   29 root      20   0  2988 1660 1320 S    0  0.3   0:00.00 bash                                                                                                                
   40 root      20   0  2344 1084  888 R    0  0.2   0:00.02 top