yasso@yassopc:~$ sudo apt-get install appmenu-qt
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package appmenu-qt 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 'appmenu-qt' has no installation candidate
Böyle bir hata alıyorum hocam, daha önceden kurulu mu olması gerekiyordu? Tam anlayamadım.