When I enter
Into my Ubuntu Server 12.04 (Physical Computer, not a VM), it reports:
sudo apt-get install python-software-properties
What do I do? I've checked the Machine's Internet Connection. It works fine.
Package python-software-properties is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted or is only available form another source
E: Package 'python-software-properties' has no installation candidate