xwiggen
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Posts
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Community Answers
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xwiggen's post in What's the official recommended method to fix NO_PUBKEY errors during apt-get update? was marked as the answer
You can download and add the key with
apt-key add <file.asc>
The keyservers are capable of synchronization and I suspect (wouldn't know for sure) the ubuntu service is.
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xwiggen's post in How to migrate system to smaller SD card? (OPi PC+). was marked as the answer
On a computer where the SD is not the root filesystem, shrink the ext4 filesystem, resize the partition to match the new size, (check if it runs to be sure), dump the SD card and hen write the image to the new SD card.
This should work without any modifications to the image itself.