I finally managed to flash Mobian, after booting my spare L5 with Jumpdrive. I wanted to check out the alternatives, as it seems development on PureOS have slowed to a crawl in the recent months.
Mobian needs some tweaking before it will work as good as Byzantium I guess, but at least I still haven’t run into that dreadful issue that makes my laptop docks unusable.
I am still running PureOS on my L5 daily driver.