این کار را کردم مشکل آپدیت حل شد اما هنوز وقتی میزنم
sudo apt-get install apt-fast
میگه
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package apt-fast 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 'apt-fast' has no installation candidate
چه کنم؟