There have been several questions asked concerning this on various Stack Exchange sites, for example Package network-manager-openvpn is not available on Ask Ubuntu, but these are generally about how to obtain the specific package despite the error. This may mean that the package is missing, has been obsoleted, orĮ: Package 'x' has no installation candidate Package x is not available, but is referred to by another package.
It is not unusual for a user of Ubuntu (or other distro using the apt package management tool to encounter the error: ~ $ sudo apt install x
