xxxx@yyyy:~$ sudo aptitude install network-manager-gnome 
[sudo] password for xxxx: 
The following NEW packages will be installed:
  network-manager{a} network-manager-gnome 
0 packages upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 995 kB of archives. After unpacking 3.736 kB will be used.
The following packages have unmet dependencies:
  connman: Conflicts: network-manager but 0.8.4~git.20110228t143901.5cdded6-0ubuntu1 is to be installed.
The following actions will resolve these dependencies:

     Remove the following packages:
1)     connman                     
2)     indicator-network           



Accept this solution? [Y/n/q/?] 
The following NEW packages will be installed:
  network-manager{a} network-manager-gnome 
The following packages will be REMOVED:
  connman{a} indicator-network{a} 
0 packages upgraded, 2 newly installed, 2 to remove and 0 not upgraded.
Need to get 995 kB of archives. After unpacking 2.318 kB will be used.
Do you want to continue? [Y/n/?] 
Err http://archive.ubuntu.com/ubuntu/ natty/main network-manager amd64 0.8.4~git.20110228t143901.5cdded6-0ubuntu1
  Could not resolve 'archive.ubuntu.com'
Err http://archive.ubuntu.com/ubuntu/ natty/main network-manager-gnome amd64 0.8.4~git.20110228t141430.abba62f-0ubuntu1
  Could not resolve 'archive.ubuntu.com'
(Reading database ... 170801 files and directories currently installed.)
Removing indicator-network ...
Removing connman ...
connman stop/waiting
Processing triggers for hicolor-icon-theme ...
Processing triggers for ureadahead ...
ureadahead will be reprofiled on next reboot
Processing triggers for man-db ...
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/n/network-manager/network-manager_0.8.4~git.20110228t143901.5cdded6-0ubuntu1_amd64.deb: Could not resolve 'archive.ubuntu.com'