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[ubuntu] Can't load ubuntu after upgrade from 10.04 to 12.04

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Hi to all,

I made an upgrade of a working-till that time-dual boot laptop containing windows XP and Ubuntu 10.04.
During the upgrade I noticed error installing libxml-libxml-perl but any way, after the upgrade I couldn't boot anything so, I decided to repair grub and I managed to fix some things and boot windows.
My reports as I tried to fix grub with live cd following this (2nd option) are: this and this.

My system was still non bootable so, I decided to manually re-install grub following this:

Code:

sudo mount /dev/sda5 /mnt
sudo mount --bind /dev /mnt/dev && sudo mount --bind /dev/pts /mnt/dev/pts && sudo mount --bind /proc /mnt/proc && sudo mount --bind /sys /mnt/sys
sudo chroot /mnt
grub-install /dev/sda
grub-install --recheck /dev/sda
update-grub

last command fixed boot menu where I can start windows but not Linux!

I decided to fix my suspicious errors during installation so continue typing as a chroot user......

Code:

dpkg --configure --pending
took 20 minutes to download missing confs!!

I insisted on having a grub problem so I decided to remove grub and re-install it following this (Purging & Reinstalling GRUB 2)BUT:

Code:

root@ubuntu:/# apt-get purge grub grub-pc grub-common
Reading package lists... Done
Building dependency tree     
Reading state information... Done
Package grub is not installed, so not removed
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 grub-gfxpayload-lists : Depends: grub-pc (>= 1.99~20101210-1ubuntu2) but it is not going to be installed
 grub-pc-bin : Depends: grub-common (= 1.99-21ubuntu3) but it is not going to be installed
 grub2-common : Depends: grub-common (= 1.99-21ubuntu3) but it is not going to be installed
 libxml-libxml-perl : Depends: perlapi-5.10.0 but it is not installable
                      Depends: libxml-sax-perl but it is not going to be installed
 ubuntu-minimal : Depends: resolvconf
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

aaaa.... that libxml-libxml-perl problem!!!
Shall we move on?

Code:

root@ubuntu:/# dpkg --configure --pending
Setting up resolvconf (1.63ubuntu11) ...
mkdir: cannot create directory `/run': Too many levels of symbolic links
dpkg: error processing resolvconf (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of ubuntu-minimal:
 ubuntu-minimal depends on resolvconf; however:
  Package resolvconf is not configured yet.
dpkg: error processing ubuntu-minimal (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 resolvconf
 ubuntu-minimal

what about?

Code:

root@ubuntu:/# apt-get -f install
Reading package lists... Done
Building dependency tree     
Reading state information... Done
Correcting dependencies... Done
The following packages will be REMOVED:
  libxml-libxml-perl
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 1,376 kB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 310697 files and directories currently installed.)
Removing libxml-libxml-perl ...
/var/lib/dpkg/info/libxml-libxml-perl.prerm: 11: /var/lib/dpkg/info/libxml-libxml-perl.prerm: update-perl-sax-parsers: not found
dpkg: error processing libxml-libxml-perl (--remove):
 subprocess installed pre-removal script returned error exit status 127
No apport report written because MaxReports is reached already
                                                              Errors were encountered while processing:
 libxml-libxml-perl
E: Sub-process /usr/bin/dpkg returned an error code (1)

or even:

Code:

root@ubuntu:/# apt-get upgrade -f
root@ubuntu:/# apt-get dist-upgrade -f

...the same!

The system is down permanently!

Any ideas???????:-(
ps: when I start now my ubuntu I receive this error message:
"could not log bootup: Address already in use. An error occurred while mounting /run"

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