I've found the culprit. This bugs still occurs for me, and its not grub's fault.
On powerpc machines, the bootloader (grub2 along with yaboot) are put on a
separate partition, which is HFS formatted.
I mount this partition as /boot/grub.
The problem is with hfsutils: even if they report (e.g. via the output
of "mount") that this filesystem is mounted read-write, after an abrupt
halting of the machine it's mounted read-only. The only real fix is to
manually unmount /boot/grub, run fsck on it which clears the dirty flag,
and then remounting it and running grub2 installation again.
So I believe that fixing the output of mount, or forcing a fsck when
mounting a hfs volume, is the only real solution to this.
Or whenever the filesystem gets dirty, and update-grub is called, you'll
get errors, potentially leaving your system unusable.
** Also affects: hfsprogs (Ubuntu)
Importance: Undecided
Status: New
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package grub-pc 1.96+20090611-1ubuntu4 failed to install/upgrade: podproces
installed post-installation script zwrócił kod błędu 1
https://bugs.launchpad.net/bugs/401663
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