This isn't a security vulnerability. What happened in fact is that you
were correctly guarded against a possible problem by the packaging
system.
The error means that the file /var/cache/apt/archives/grub-
common_1.98-1ubuntu7_i386.deb has somehow been corrupted and isn't a
valid package. Now, it's odd that it managed to get that far without
being caught by previous checks, but no real harm was done. The
possibilities are:
1) somebody is carrying out a sophisticated attack, and has managed to fool
the package checksums and the signature chain that ensures their integrity;
2) your hard disk is becoming faulty, and has corrupted the package data
between download and installation;
3) some low-level operating system fault caused an error while reading the
package off the hard disk.
I think 1) is unlikely; if that were the case, they'd have managed to
produce something that's actually a valid package. Either 2) or 3) is
more likely. On general principles I'd recommend taking a backup and
using something like smartmontools to see if your hard disk seems to be
failing (I've had this happen to me just recently, and it was no fun to
deal with - fortunately I had a backup and didn't lose any data).
You can probably get past your immediate problem by running 'sudo rm
/var/cache/apt/archives/grub-common_1.98-1ubuntu7_i386.deb' in a
terminal, and then repeat the upgrade. (If your package manager can't
cope with the current state, then that's a separate bug, but in any case
'sudo dpkg --configure -a; sudo apt-get install grub-common; sudo dpkg
--configure -a' should be enough to get to a point where it can.
In any event, this is not a bug in grub2 - that package was definitely
valid at our end.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
--
package grub-common 1.98-1ubuntu5 failed to install/upgrade: corrupted
filesystem tarfile - corrupted package archive
https://bugs.launchpad.net/bugs/673418
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