I have an Raspberry Pi 4 - currently with Ubuntu 20.04 desktop installed. Due to some issues with some python packages, I want to install 18.04 desktop instead, which I know works.
The problem is that the official ubuntu/raspberry-pi download is the 20.04 version (do they really not provide previous relases?!). I have tried downloading an 18.04 ISO-image and flash that onto the SD-card using Etcher, but nothing happens when I start my Raspberry with that SD-card.
Using the "Raspberry Pi Imager v1.4" to flash the SD, I can only chose the 20.04 version, or to browse for a .img file, where I have an ISO-file - I cannot find a 18.04 desktop .img file to download.
Any suggestions on how to get 18.04 Desktop installed - or is the best way just to use 18.04 server and then install desktop on that?