I'm writing this on Ubuntu Touch running on a Raspberry Pi 3 using the OSK on the Pi 7" touchscreen.
Thanks for the hard work put in. There are some issues still of course. Something odd with the graphics in Pi 4 windows and a slight overlap on the touch screen making left or right swipes tricky but this feels so much closer to useable than the first image. I don't think it is too far now from a platform that will showcase convergence and perhaps even let us develop apps live. I appreciate this is a side project so the UBports developers can't make it a high priority. Hopefully though the work done will help towards getting other Arm64 non-Android ports running smoothly. As a long term Linux user - trying to help get Unity8 or UBports working on the Pi has been very humbling - I'd no idea how little I knew/know!

Best posts made by Mark
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RE: Ubuntu Touch Q&A 63 This Saturday 16th Of November At 19:00 UTC
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Pinephone UT progress
Is there a place where UT progress and dead ends with the Pinephone are being documented? I find there is so much posted in the Pinephone group on Telegram and a lot of it is not UT specific so I don't follow it as much as I should. I'd still like to know more and try to apply it to the Pi.
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RE: Ubuntu Touch Q&A 63 This Saturday 16th Of November At 19:00 UTC
I realised that that post may look like I'm claiming some credit and that would be wrong.
Early on I did some blundering about in the dark and kept posting about my inevitable failures to encourage someone who knew what they were doing to help - that is the sum total of my contribution -
RE: Continuation of rpi effort and how to test
Good to see great progress.
Using the latest image the Pi4 boots and runs well although a graphics issue means that you can't read anything opened in a window.
Scaling is now sorted on the monitor and when using the 7 inch touch screen.
The graphics issue does not affect the Pi3 but it is (understandably) frustratingly slow.
The touch screen worked on the first image but not on the most recent one. UPDATE It woked after a reboot but as the left and right edges are slightly offscreen it restricts its usefuleness.
UT on the Raspberry Pi feels much closer now to something that will work. Thanks to those who understand all this far more than me for putting the work in. -
RE: Pinephone UT progress
@advocatux Thanks - oh and apologies for re-opening a too old thread elsewhere
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RE: Single board computers
I have a touch screen for my Raspberry Pi. Ubuntu Touch is well designed for touch screen, small screens and low spec devices. Plus UT running natively on a Pi opens up a huge potential development base.