Comment 0 for bug 55553

To reproduce:
1. https://staging.launchpad.net/distros/ubuntu/+source/gnome-system-tools/+bug/18632
2. Click on the "Ubuntu" task.
3. Edit the "Package" field. enter "gnome-system-tools ".
4. The error received:

"('Invalid value', token u'mozilla-firefox ' not found in vocabulary)"

Launchpad should display a proper error message, telling that an illeagle package name was entered, and explain briefly the constraints a package name has.