Can't update OS Mobian Phosh

[vortex]

I tried my first update using the GUI software update program like you did and ran into a similar but worse issue (OS didn't work at all) and had to re-install and instead do the first update from the terminal with apt, which worked without a problem. Note, the first update that generates initramfs is a little scary because it takes a long time to generate it and during that time it is easy to wonder if something is wrong. If the phone isn't plugged in, you may need to periodically wake it up to get it to finish.