سلام
کد رو که میزنم این پیغام رو میده
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libc-dev 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 libc-dev has no installation candidate
چکار کنم؟؟؟!!!!!!!