من هر وقت دستور sudo apt-get install عمل نمی کنه مثلا می خوام یک بسته رو نصب کنم .
mohammad@ehtemam:~$ sudo apt-get install blender
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package blender 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 blender has no installation candidate
نمی دونم چکار کنم دارم کلافه می شم لطفا کمک کنید .