APT ordering of reposiitories

[Ralf Mardorf]

On Fri, 1 May 2020 13:34:52 +0100, Bill Purvis wrote:
>Found that downloaded it and it installed OK with
>    dpkg -i iproute2_4.18.0-1ubuntu2~ubuntu18.04.1_amd64.deb

Installing a downloaded package with dpkg doesn't install a package and
possible dependencies from a Mint third party repository. By installing
iproute2 from the Ubuntu repositories, you might have broken your Mint
install.

Assuming the correct repositories for your distro are enabled and
unwanted repositories are disabled, you need to run

   sudo apt update && sudo apt upgrade

to do a prober upgrade. Running "sudo apt upgrade" without syncing the
package index files by running "sudo apt update" first, doesn't work.