$ sudo apt-get install zzuf
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package zzuf 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 from another source
E: Package zzuf has no installation candidate
$ sudo apt-get install zzuf
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package zzuf 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 from another source
E: Package zzuf has no installation candidate