@Jules I have the same issue on the OPO (rc). Everything else seems to work as usual but I can no longer move the map by sliding with my finger. If I attach a mouse then it works fine scrolling as expected whilst holding down the left button and moving the mouse.
@Mark Sound now works (HDMI and audio jack) on recent images with a newer kernel. Apparmor can be made to work by making some kernel changes (copied from similar changes made for the Pinephone) but this is not yet in the downloadable image.
@Pulsar33 Sorry if I misled you. I used the title "Progress on the Pi 3". I'd added in that Wifi is working on the Pi 4 for information but perhaps I could have been clearer. You can access the Pi 4 using SSH (which is why I know the wifi is now working) but the graphics problem still needs someone with a lot more knowledge and skill than I have to fix it. You can log into the Pi 4 in spite of the graphics issue and a screenshot looks fine even if the actual display has all the feedback lines. However if you open an app in a window then do a screenshot the graphics problem can still be seen in the window on the screenshot.
@Flohack I have now updated the readme in a similar style to the Pinephone one and put in a merge request. Apologies if I've not followed the correct procedure - Gitlab is still new to me.
Re: Continuation of rpi effort and how to test
There was a mouse hover event bug that has been fixed upstream making selection with mouse and keyboard a vastly better experience - not perfect yet but much more useable. Worth trying again if you found it too frustrating before.
Wifi is now working on the Pi 3 and Pi 4. We are trying to sort out sound and Bluetooth - any help welcome.
Due to the pinephone and other arm64 devices most apps are available and have been updated to work.
One continuing bug seems related to content hub and Apparmor not working. This means that copying files or pictures between apps is not working (and leads to crashes at times).
Another cause of crashes seems to be related to windows on the screen. Try not to move or change size when a window is rendering and windows rendering over other windows can also cause problems.
The Pi has not got much ram so running multiple browser tabs and/or too many apps at once will lead to problems.
https://ubports.com/blog/ubports-blog-1/post/raspberry-pi-266
https://gitlab.com/ubports/community-ports/raspberrypi
https://t.me/UBports_pi
@Mark Thanks to the Q&A for kindly complimenting my contribution. I try my best to learn and share. From a distance it is hard to know how helpful that is. I'll keep on learning, sharing and appreciating the support I get from the community.
PS I need to make my questions shorter and clearer 
Congratulations for all the work on the Pinephone and other Arm64 devices. One consequence of this is UT becoming more stable and useable on the Raspberry Pi. My question is: Where (website, group,book etc.) can I go to learn more so that when community members with good UT developer skills and knowledge come up with suggestions on how we might solve issues I have a better chance of knowing what they are talking about and how to start? Some things are making way more sense to me now than they did a year ago but I'd like to travel further down the linux user to developer road so my contributions are more helpful to the community.
On Pi 3 with touchscreen it starts without an external keyboard or mouse. The bug where you needed to unplug the mouse and plug it in again was fixed a long timealreadyThere are still niggling selection problems but lots of improvements. Good choice on the Openstore (though some apps still use oxide and ubuntu.web and they will need to be updated to work on the Pi). For me Dekko, Morph, TELEports, Openstore, Terminal, UT Tweak Tool, Document Viewer and many more work well already.
@Pulsar33 Several of us have a Pi 4 (mine is also 4Gb) but until someone (who knows how) can put in the work needed to get the tiling vs Unity8 problem fixed we can't get very far. However the more bugs and issues we can identify and fix on the Pi 3 in the meantime the better the Pi 4 experience will be when it comes.
I've tried image 117 and it seems to work as well on the Pi 3B+ as 95. It still has many of the same issues (wifi, selection and audio). Rodney helped fix the bug where the swipe tutorial covers the screen but won't disappear (because you can't swipe like on the phones).
If you only have a touchscreen and you find your view is getting blocked by the first run tutorial then edit /var/lib/AccountsService/users/phablet so that the line starting DemoEdgesCompleted reads DemoEdgesCompleted=[‘left’, ‘top’, ‘right’, ‘left-long’]
You can do this via ssh or (with difficulty) in the terminal squinting through the tutorial screen.
If you have an hdmi monitor and connect to that it should open in desktop mode and after that it will be fine in the touchscreen next time it is run.
The Super-a Key opens the launcher just like on Gnome.
@ComLarsic Can you not log out of the GUI and then install it from the prompt?
@WLBI I'm too mean to pay £34 a month when I can get away with £14
@WLBI I pay for 2GB a month, my partner pays for 20GB a month. Data in the UK is only unlimited on expensive contracts. I have unlimited minutes and texts.
Very quick and easy to do. Access Network Settings by pulling down from the top, select Mobile Settings, Slide Cellular data to off.
@3arn0wl I use Gparted. Easy to do when the SD card is in another computer (or in a USB card reader attached to the Pi running Raspian) and you can therefore unmount the partitions to edit them. Good luck.
@3arn0wl the Telegram group is often the quickest place to get help: https://t.me/UBports_pi
@3arn0wl Possibly you just need to redo the SD card. Did you unzip the image before writing it? After writing the card did you expand the root partition into the unallocated space and did you use a beefed up power supply and connect up an Ethernet cable when trying to boot?
Seven blinks suggests that the kernel image is not found. https://raspberrypi.stackexchange.com/questions/41450/raspberry-pi-not-working/41455#41455
I've never used Etcher.
There has been a lot going on but it is only recorded in the Telegram group. https://t.me/UBports_pi
The Pi3 is working fairly well (with swap) although sound and wifi are still issues and selection (without a touch screen) has its peculiarities. Morph browser and Dekko email seem pretty stable, Terminal works a treat for installing click packages built for Arm64. Running update and upgrade mostly brings improvements but might break it so consider making a backup.
Here is what is in the Telegram pinned post:
Installing Ubuntu touch is pretty easy. The default login is phablet as is the password. It should just login itself but you will need that when using the terminal for things requiring sudo or when changing some settings in the GUI. If you can use an ethernet cable at the setup stage it avoids any wifi issues (that are being worked on). Selection by mouse is a bit buggy still, sometimes selecting with "Tab" then hitting "Return" will be easier.
Download an image from https://ci.ubports.com/job/rootfs/job/rootfs-rpi/
After image #90 (15th December) there was a change which meant that the Pi 4 graphics were broken not just on windows but on the login screen (it works but you can't see that it works on a monitor) - keep trying newer images as that will eventually be fixed. This is not a problem for the Pi 3.
Feel free to experiment with newer images and let us know your experiences but there may not be someone else to compare notes with yet.
Flash SD card:
Use DD in the Linux terminal or on windows https://www.balena.io/etcher/ to write the image to the sd card once you have unzipped it. Raspberry Pi sites will give details of how to do all this.
Remember to expand the main partition to fill the card. Easiest to use a card no bigger than 32GB.
Swap:
It works better with swap. Type sudo apt-get install dc dphys-swapfile in the terminal if you want a swap partition of 2GB
Development:
https://gitlab.com/ubports/core/rootfs-builder-debos and the multiple deb packages that are used are built on ci.ubports.com with the source on github.com/ubports/
Apps:
https://forums.ubports.com/topic/3323/arm64-apps-and-testing is a good place to start when looking for arm64 apps and how to install and test them.
Some of the arm64 apps being tested for the pinephone and other arm64 devices work, others just shut down or behave oddly. Openstore is getting more arm64 architecture apps.
Sound is not sorted yet and neither is the Pi camera. However the Pi touchscreen works. Expect bugs and crashes - we are at an early stage. Probably more Alpha than Beta testing but things are developing quickly. Wifi pretends to work but ethernet works well. Have fun and please use the UBports forums, Github or associated Telegram groups to learn more, to give feedback or to help solve bugs or other issues.
@Mark Brian Douglas now has an experimental open store for multi arch which worked well for me on the Pi. The Telegram UBports Raspberry Pi group is a good place to follow progress.
I know this is about the Raspberry Pi 4 but if any of you, frustrated with the lack of progress, have a Raspberry Pi 3 you may want to try that as it is working reasonably well but with bugs that could do with some attention. Solving them should, in many cases, also help with the Pi 4 once the (compositor?) bug is fixed. Some of the existing UT apps have been recompiled for arm64 so we have working file manager and UT Tweak amongst others. The Telegram group has instructions to add Swap which makes life a lot easier.