Public bug reported:

Binary package hint: grub2

My system is a 64 bit version of 9.10.  I have my boot drive with two
physical disks in a raid 1 using mdadm.  I upgraded from 9.04, so grub-
pc was not part of the upgrade.  However, my grub menu stopped working
(didn't listen to ESC at boot up) so I tried to install grub2 (grub-pc).

The apt-get installation of grub-pc failed, but first uninstalled grub.
I needed to boot from a live CD and use its version of grub (grub-pc
refused to write to a RAID array) to get my system booting again.
Although my system boots now, I can now no longer install either grub or
grub-pc.

I'm posting the apt-get messages I get when trying to fix my system
below.  I would be happy with any solution that leaves me with a
functioning version of grub or grub-pc.

Thanks!

Patrick

pg...@megalodon:~$ sudo apt-get install grub
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  grub-doc
The following packages will be REMOVED:
  grub-pc
The following NEW packages will be installed:
  grub
0 upgraded, 1 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0B/903kB of archives.
After this operation, 188kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
Preconfiguring packages ...
(Reading database ... 319988 files and directories currently installed.)
Removing grub-pc ...
dpkg (subprocess): unable to execute installed pre-removal script: Exec format 
error
dpkg: error processing grub-pc (--remove):
 subprocess installed pre-removal script returned error exit status 2
dpkg (subprocess): unable to execute installed post-installation script: Exec 
format error
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
 grub-pc
E: Sub-process /usr/bin/dpkg returned an error code (1)
pg...@megalodon:~$ sudo apt-get install grub-pc
Reading package lists... Done
Building dependency tree       
Reading state information... Done
grub-pc is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0B of additional disk space will be used.
Setting up grub-pc (1.97~beta4-1ubuntu4.1) ...
dpkg (subprocess): unable to execute installed post-installation script: Exec 
format error
dpkg: error processing grub-pc (--configure):
 subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
 grub-pc
E: Sub-process /usr/bin/dpkg returned an error code (1)
pg...@megalodon:~$ 


pg...@megalodon:~$ apt-cache policy dpkg
dpkg:
  Installed: 1.15.4ubuntu2
  Candidate: 1.15.4ubuntu2
  Version table:
 *** 1.15.4ubuntu2 0
        500 http://us.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status
pg...@megalodon:~$ apt-cache policy grub
grub:
  Installed: (none)
  Candidate: 0.97-29ubuntu59
  Version table:
     0.97-29ubuntu59 0
        500 http://us.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status
pg...@megalodon:~$ apt-cache policy grub-pc
grub-pc:
  Installed: 1.97~beta4-1ubuntu4.1
  Candidate: 1.97~beta4-1ubuntu4.1
  Version table:
 *** 1.97~beta4-1ubuntu4.1 0
        500 http://us.archive.ubuntu.com karmic-updates/main Packages
        500 http://security.ubuntu.com karmic-security/main Packages
        100 /var/lib/dpkg/status
     1.97~beta4-1ubuntu3 0
        500 http://us.archive.ubuntu.com karmic/main Packages

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
grub-pc cannot be installed or uninstalled
https://bugs.launchpad.net/bugs/536867
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