با زدن دستور sudo apt-get install smplayer
پیغام زیر را نمایش می دهد
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package smplayer 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 smplayer has no installation candidate
حالا باید چی کار کنم؟