PINE64

Full Version: Does Ubuntu modify a Pinephone SD boot card?
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I have installed postmarkedOS to the external SD card of my Pinephone, since I had troubles writing with Abiword to the external SD card. So I installed the whole OS with Abiword there.

Then I have sticked the SD card with a reader into a Windows PC, which could not read the SD card. I did not find an easy solution to solve which was convincing for me personally.

So I installed Ubuntu on an external drive on my PC. There I could see and open the files on my SD card with postmarkedOS on it, and also write to it with Abiword.

But when I put the SD card back to my Pinephone, the SD card does not boot anymore.

Why does my Pinephone not boot anymore from this SD card?