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Is it possible for a shell to (automatically) source files after the first prompt is shown?

As you have found out, running commands in the background with & will put them in a subshell, and a subshell can't change variables/environment variables of the parent process. ("can't" ...
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how to suppress btrfs startup scan

I found the following answer: modify the file /usr/share/initramfs-tools/scripts/local-premount/btrfs I did only insert a # in the line where the btrfs scan is called. than did the following commands: ...

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