Public bug reported:
BUG DESCRIPTION:
when casper try to mount multiple read-only file systems using overlay unionfs,
the second mount will fail because the upper directory must be writable.
SOLUTION:
use multiple lower directories to replace read-only upper directories
WORKAROUND:
use option: union=aufs
BUG LOCATION:
In Kubuntu 15.10 LiveCD
in file /casper/initrd.lz
in file /scripts/casper
in function setup_unionfs
somewhere after line '# Record the format we are using for this mount.'
** Affects: casper (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1562994
Title:
overlayfs multiple read only file system mount fail
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