apt-get install openerp
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed
  openerp
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/63.0 MB of archives.
After this operation, 252 MB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  openerp
Install these packages without verification [y/N]? y
Selecting previously unselected package openerp.
(Reading database ... 51031 files and directories currently installed.)
Unpacking openerp (from .../openerp_7.0-20130715-231029-1_all.deb) ...
Processing triggers for ureadahead ...
Setting up openerp (7.0-20130715-231029-1) ...
Starting openerp-server: openerp-server.
Processing triggers for python-support ...