Alarm app available that wakes the phone

[dukla2000]

On Mobian I installed and have it running fine from the .deb - download that and install it with apt which will resolve all the dependencies. In the directory yu download the deb
sudo apt install ./thefilename.deb

That's what I did. I downloaded he Mali64.deb. Should I have downloaded the ARM64.deb?

You need the arm package - this one.

(To be fair I installed version 1.1-1 a while ago, so there may be problems with the current version 1.3-1 but who knows?)

ps: just removed 1.1 and installed 1.3 on my Mobian install fine. Which fails on runtime as python3-psutil needs to be manually installed and then all is well (on Mobian).