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I would like to install Mono 5.18.0 on Ubuntu 20.04. All I could find was an installation guide for accessing older releases which technically breaks down to:

If you want to pin an older version of Mono you can modify the Debian repository to “stable-jessie/snapshots/X.XX.X” instead of “stable-jessie”. For example, “stable-jessie/snapshots/3.10.0” will lock you to that version.

How do I do that? My /etc/apt/sources.list/d/mono-official-stable.list file includes the following record, deb https://download.mono-project.com/repo/ubuntu stable-focal main. Will it work if I edit it like this?

deb https://download.mono-project.com/repo/ubuntu 5.18.0

and then

sudo apt update
sudo apt install mono-develo # or mono-complete?
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You have to use the following syntax

deb http://download.mono-project.com/repo/ubuntu bionic/snapshots/5.18 main

In the above line bionic is used because it has 5.18 branch.

But this will not work on Ubuntu 20.04 LTS because of outdated dependencies.
So you have to consider using Docker or VM with 18.04 LTS inside to proceed.

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