Remove PPA Files for Auto Update

Tailscale for example had issues updating on VPN. To remove the unwanted PPAs, such as Tailscale, follow these steps:

Get a list of installed PPAs

ls /etc/apt/sources.list.d/

It returns something like this

asbru-cm-release.list  proposed.list  sublime-text.list  tailscale.list  unit193-ubuntu-encryption-jammy.list  vscode.lis

To remove tailscale, use this command

sudo rm /etc/apt/sources.list.d/tailscale.list

Purge associated packages

sudo apt-get purge tailscale

Update the package list

sudo apt update