*** This bug is a duplicate of bug 1889556 ***
https://bugs.launchpad.net/bugs/1889556
> 1. How can I boot the system from within the Grub rescue prompt? I
don‘t have a live System and can‘t get hands on one for several days.
You can't. The part of grub that loaded from the MBR (and printed 'grub
rescue>') is incompatible with stage 2 of grub at /boot/grub/. You
either need to upgrade the MBR part ('grub-reinstall /dev/...') or
downgrade /boot/grub/ somehow (perhaps copy off another system?). Either
way you need the install media.
> 2. I did reboot my computer right now, and minutes before I did a full
upgrade. From the above conversation one can see that the bug is known
for almost a week. So why is there no emergency patch like a package
that goes back to the last functional version and does a grub reinstall?
The bug (#1889556) has been fixed. Did you 'apt-get update' and 'apt-get
upgrade' prior to rebooting? If so, 'apt-get upgrade' would terminated
early with an exit code, which is as much of a hint as dpkg can give you
that grub is hosed, and needs fixing ('dpkg-reconfigure grub-pc') prior
to reboot.
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https://bugs.launchpad.net/bugs/1889509
Title:
grub boot error : "symbol 'grub_calloc' not found
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