@madas Yes you need to create Xiaomi account to be able to unlock phone's bootloader. What 155 hours long process means, is that it is some security measure from Xiaomi, if I understand it right. When you try to unlock bootloader for the first time it fails and tells you to wait 155 hours (1 week) and after that time you should be able to unlock bootloader without problems.
As for point number 3: Phone must be running Android 10, for system partitions to be in correct place for UT installer to work, otherwise you could end up bricking the phone. So if you are on version 11 you need to downgrade, there should be links to Android 10 ROMs somewhere in this thread.
For example I used this ROM:
Redmi Note 9 Pro Global EEA
Stable
Fastboot
V12.0.1.0.QJZEUXM
Android 10.0
4.3 GB
2020-11-10
Download https://xiaomifirmwareupdater.com/miui/joyeuse/stable/V12.0.1.0.QJZEUXM/
Point 4: You must downgrade if phone is running version 11 or newer.
If there is something else I missed from your post just ask.

EDIT: Phone must be running Android 10 to be able to install UT.

@josele13 said in App grouping:

I think Waydroid apps should be in Waydroid, not put android apps launchers in the UT launcher

I agree with you, or there should be an option when installing Waydroid for not adding Waydroid apps into UT launcher.

@emphrath said in App grouping:

Add to this the relics of Waydroid uninstalled apps and you're in for a burning hell of scrolling everytime you want to do sth slightly unusual

You can manually delete uninstalled (or currently installed) apps from launcher by finding its .desktop files in /home/phablet/.local/share/applications, though some app come back into launcher at next launch of Waydroid for some reason.

I am planning to buy Xiaomi Redmi Note 7 and put in two SIM cards. On UT devices page there is no mention about dual SIM functionality. Does that mean that two SIM cards is not possible to use at the same time? Or this feature is not yet implemented on this phone because it uses a hybrid slot for the cards (2 SIMs or 1 SIM + microSD card)?

@idj take look at this thread https://forums.ubports.com/topic/8579/newbie-help-removing-extra-waydroid-icons/2 it will definitely help you with your problem.

Just a quick question, does it matter if I install Android 10 ROM which is Global or Europe (EEA) one? Or is there a way to check which ROM type is currently installed in the device?

@josele13 Thank you for your answer, just one more thing: Is it slot dependent for card to be for example in slot 2 to make calls (on Oneplus 6/6T it is) or it doesn't matter? And both SIMs can receive and send messages? Can't wait to try Ubuntu Touch on this device!

@nitanmarcel The phone was bought in Europe, so my guess is that it has Europe ROM, but I don't now this for certain. Will install probably the Europe one then and I hope there won't be any problems with installation of UT later. Thanks for your answer.

@dpitti Will try that one then, tomorrow I can unlock bootloader and then I hope everything will go as planned.

@josele13 Managed to flash UT to my Xiaomi Redmi Note 9 pro today, it seems to work fine, but not sure if OTG is supposed to work or not, have you tested it?

@josele13 Tested it again and it turns out, my OTG dongle is bad, because with another it was working fine. And also checked settings and it is showing, that total storage is 223 GB, but the phone is only 128GB, I am confused now.

@josele13 I tried to test Waydroid, but with no luck. It installed through terminal and app successfully, but the problem is, that when attempting to run it it tried to initialize, but crashed after few seconds. Libertine works well, it depends on the packages you install. I tried to run Firefox in it, but couldn't load a single page. It just displayed "Tab crashed" and app crashed after few seconds. Also tried VLC, but it wasn't able to start at all.

@dpitti Will try that again then, thanks for suggestion. Libertine Tweak Tool looks fine, but I might have done something wrong back when I was first testing it, because it did nothing.

@nitanmarcel So the automatic reboot triggered by its installation is not enough?

@josele13 Yes, I did as it was suggested to me, Waydroid now works, but for some reason the phone is unable to find my hotspot from laptop, though I had used it without problems before. Could be the problem that there are quite a lot of other wifi networks around? I finds lots of them, but not mine.

@josele13 No, I meant connecting to hotspot running on laptop. Phone sees lots of networks, but not mine wifi network.