How to fix E: Package 'package-name' has no installation candidate (installed via snap) in APT

First, verify if your system has a blocking preference file:

ls /etc/apt/preferences.d/nosnap.pref

If the file exists, this confirms APT is deliberately blocking snap packages. If it doesn't exist, the issue may be a package availability problem in your repositories.

Before making changes, refresh your package list to ensure you have the latest repository information:

sudo apt update

This will re-index all available packages and may resolve the issue if it was just a stale cache.

If you want to enable snap on Linux Mint, remove the nosnap.pref file that blocks snapd:

sudo rm /etc/apt/preferences.d/nosnap.pref

Then update your package list again:

sudo apt update

After this, you should be able to install snapd and snap packages through APT.

If you prefer not to enable snap support, consider using Flatpak as an alternative universal package manager. Linux Mint includes native Flatpak support:

sudo apt install flatpak
flatpak install flathub <app-name>

Flatpak provides similar functionality to snap and may be better integrated with your distribution.

After removing the blocking file, verify that snap works:

sudo apt install snapd
sudo systemctl start snapd
sudo systemctl enable snapd
snap --version

You should see the snap version if installation was successful.