Works for me on Vollaphone X running 20.04 OTA 5 (eagerly awaiting OTA 6).

@TheBird Worked for me too. Many thanks.

@carl I was able to swipe from the right to see all open aps and then dismiss the black screen by swiping it up or down. No need to restart.

@domubpkm I get the same thing on Vollaphone X running 20.04 OTA 5.

The log shows:-

[09/11/2024 13:05] library "libpq_cust.so" not found
[09/11/2024 13:05] Creating a QMirClientScreen now
[09/11/2024 13:05] file:///builds/ubports/development/apps/lomiri-music-app/app/music-app.qml: No such file or directory
[09/11/2024 13:06] qt.qpa.mirclient: Attempted to deliver an event to a non-existent window, ignoring.

@Salah please wait for ikoz to confirm ownership and permissions of the files and folders before giving up.

@ikoz It might be worth confirming owners/groups and rwx of the icon folders and files.

@musicologist I have a Vollaphone X running 20.04 OTA 5 and I do not see this problem. It was also OK on 16.04.

@benzer On my Vollaphone X running 20.04 OTA 5 I can get to the SD card in the file manager by launching it then clicking on the menu top left (parallel lines) then the SD card is at the bottom of the list - a string of letters and numbers. Clicking on this gives me the standard user folders (music, downloads, etc) on the SD card.

@musicologist You could try Settings -> Security & privacy -> Locking and unlocking -> Lock security and then toggle off the switch for fingerprint under Biometrics.

@naizena Settings -> About -> OS and you should find it in the 'Device build description'

@Salah You could try Settings -> Battery -> Lock when idle and select 'never' to keep your display on all the time.

@xpeer It should be the pin/pass phrase you use to start your phone.

@halucigenia Only if 3G is available.

@halucigenia I am also on 3 in the UK. If you for to Settings, Mobile, and then select 2G/3G/4G then mobile data and text work fine.... but you will struggle to make a phone call as VoLTE is not currently supported in UT and 3 have mostly only now got 4G and 5G coverage (VoLTE = 4G).
If you select 2G/3G then you might be able to make calls if your nearest tower has any 3G kit installed and switched on. I struggle to get a 3G signal in most of the UK now but weirdly it is still OK around Newark.
I am definitely thinking of running my Vollaphone X as a WiFi tablet and buying a cheap Android phone to make and receive calls until the VoLTE problem is sorted in UT.

@MrT10001 Or you could make the file system writrable. Make the changes you want and take backup copies to your PC along with a note of where they need to be. Then remount the filesytem as read only.

OK the next OTA would probably wipe your changes, but you can put them back from your PC.

@naizena Weird. I wonder what the difference is?

@Kharim On Vollaphone X the first tap on the fingerprint reader appears to be the equivalent of.pressing the power button. The second tap on the reader unlocks the phone.

@Peter-Gamma Here are three screen shots showing the options available in settings under display languagesin UT.

Sorry, unable to upload last screenshot, but you get the idea.

@jojumaxx Silly question but did you try setting the alarm volume in the clock app settings (cog wheel top right)?