Following circumstance caused the strange behavior:
When the root disk went full, I tried to free disk space by deleting the
content of the /tmp directory (sorry, I forgot to mention this).
... and when using apt-btrfs-snapshot and doing a 'apt update' the btrfs
partition will be mounted under /
** Project changed: launchpad => ubuntu
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https://bugs.launchpad.net/bugs/2063029
Title:
Symlinks /bin, /sbin, /lib ... disappeared after root disk full
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