After I (painfully) managed to install Skype on my Ubuntu 12.04 LTS, I'm experiencing since months ago a packages issue I cannot fix.

Have a look to my last post in order to know what caused this issue: Install Skype on Ubuntu 12.04 LTS 64-bit

If I try to install system Updates the Update Manager closes unexpectedly stating that the package system is broken and throws the following error:

The following packages have unmet dependencies:



grub-efi-amd64: Depends: grub2-common (= 1.99-21ubuntu3.9) but 1.99-21ubuntu3.10 is installed

                Depends: grub-efi-amd64-bin (= 1.99-21ubuntu3.9) but 1.99-21ubuntu3.10 is installed

If I run sudo apt-get -f install in order to fix potential packages issues I get the following:

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Correcting dependencies... Done

The following packages were automatically installed and are no longer required:

  linux-image-3.5.0-26-generic linux-headers-3.5.0-26

  linux-headers-3.5.0-26-generic

Use 'apt-get autoremove' to remove them.

The following extra packages will be installed:

  grub-efi-amd64

The following packages will be upgraded:

  grub-efi-amd64

1 upgraded, 0 newly installed, 0 to remove and 28 not upgraded.

2 not fully installed or removed.

Need to get 39.5 kB of archives.

After this operation, 0 B of additional disk space will be used.

Do you want to continue [Y/n]? y

Get:1 http://archive.ubuntu.com/ubuntu/ precise-updates/main grub-efi-amd64 amd64 1.99-21ubuntu3.10 [39.5 kB]

Fetched 39.5 kB in 0s (154 kB/s)        

dpkg: dependency problems prevent configuration of grub-efi-amd64:

 grub-efi-amd64 depends on grub2-common (= 1.99-21ubuntu3.9); however:

  Version of grub2-common on system is 1.99-21ubuntu3.10.

 grub-efi-amd64 depends on grub-efi-amd64-bin (= 1.99-21ubuntu3.9); however:

  Version of grub-efi-amd64-bin on system is 1.99-21ubuntu3.10.

dpkg: error processing grub-efi-amd64 (--configure):

 dependency problems - leaving unconfigured

dpkg: dependency problems prevent configuration of grub-efi-amd64-signed:

 grub-efi-amd64-signed depends on grub-efi-amd64 (>= 1.99-21ubuntu3.5); however:

  Package grub-efi-amd64 is not configured yet.

dpkg: error processing grub-efi-amd64-signed (--configure):

 dependency problems - leaving unconfiguredNo apport report written because the error message indicates its a followup error from a previous failure.

                                                                     No apport report written because the error message indicates its a followup error from a previous failure.



Errors were encountered while processing:

 grub-efi-amd64

 grub-efi-amd64-signed

E: Sub-process /usr/bin/dpkg returned an error code (1)

If I run sudo dpkg --configure -a I get:

dpkg: dependency problems prevent configuration of grub-efi-amd64:

 grub-efi-amd64 depends on grub2-common (= 1.99-21ubuntu3.9); however:

  Version of grub2-common on system is 1.99-21ubuntu3.10.

 grub-efi-amd64 depends on grub-efi-amd64-bin (= 1.99-21ubuntu3.9); however:

  Version of grub-efi-amd64-bin on system is 1.99-21ubuntu3.10.

dpkg: error processing grub-efi-amd64 (--configure):

 dependency problems - leaving unconfigured

dpkg: dependency problems prevent configuration of grub-efi-amd64-signed:

 grub-efi-amd64-signed depends on grub-efi-amd64 (>= 1.99-21ubuntu3.5); however:

  Package grub-efi-amd64 is not configured yet.

dpkg: error processing grub-efi-amd64-signed (--configure):

 dependency problems - leaving unconfigured

Errors were encountered while processing:

 grub-efi-amd64

 grub-efi-amd64-signed

My understanding is that the root cause is unmet dependecies of packages grub-efi-amd64 and grub-efi-amd64-signed, so I have tried what is described here How do I resolve unmet dependencies after adding a PPA? but the problem still persist.

I'm not sure if the removal of the conflicting packages would fix the issue, but I haven't done it yet as I'm afraid I could ruin my system as it has EFI boot and I'm booting it with GRUB. For the same reason I haven't tried to run sudo apt-get -u dist-upgrade, as perhaps the conflicting packages could be automatically removed.

I'd like to know if others have had a similar experience as well as possible solutions to this.

Just as additional info this is the output of gedit /etc/apt/sources.list:

# deb cdrom:[Ubuntu 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130213)]/ dists/precise/main/binary-i386/



# deb cdrom:[Ubuntu 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130213)]/ dists/precise/restricted/binary-i386/

# deb cdrom:[Ubuntu 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130213)]/ precise main restricted



# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to

# newer versions of the distribution.

deb http://archive.ubuntu.com/ubuntu precise main restricted



## Major bug fix updates produced after the final release of the

## distribution.

deb http://archive.ubuntu.com/ubuntu precise-updates main restricted



## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu

## team. Also, please note that software in universe WILL NOT receive any

## review or updates from the Ubuntu security team.

deb http://archive.ubuntu.com/ubuntu precise universe

deb http://archive.ubuntu.com/ubuntu precise-updates universe



## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 

## team, and may not be under a free licence. Please satisfy yourself as to 

## your rights to use the software. Also, please note that software in 

## multiverse WILL NOT receive any review or updates from the Ubuntu

## security team.

deb http://archive.ubuntu.com/ubuntu precise multiverse

deb http://archive.ubuntu.com/ubuntu precise-updates multiverse



## N.B. software from this repository may not have been tested as

## extensively as that contained in the main release, although it includes

## newer versions of some applications which may provide useful features.

## Also, please note that software in backports WILL NOT receive any review

## or updates from the Ubuntu security team.



deb http://archive.ubuntu.com/ubuntu precise-security main restricted

deb http://archive.ubuntu.com/ubuntu precise-security universe

deb http://archive.ubuntu.com/ubuntu precise-security multiverse



## Uncomment the following two lines to add software from Canonical's

## 'partner' repository.

## This software is not part of Ubuntu, but is offered by Canonical and the

## respective vendors as a service to Ubuntu users.

deb http://archive.canonical.com/ubuntu precise partner

deb-src http://archive.canonical.com/ubuntu precise partner



## This software is not part of Ubuntu, but is offered by third-party

## developers who want to ship their latest software.

# deb http://extras.ubuntu.com/ubuntu precise main

# deb-src http://extras.ubuntu.com/ubuntu precise main

deb http://archive.canonical.com/ precise partner

deb-src http://archive.canonical.com/ precise partner

And gedit /etc/apt/sources.list.d/* (different files):

deb-src http://ppa.launchpad.net/cassou/emacs/ubuntu precise main



### THIS FILE IS AUTOMATICALLY CONFIGURED ###

# You may comment out this entry, but any other modifications may be lost.

deb http://dl.google.com/linux/chrome/deb/ stable main



### THIS FILE IS AUTOMATICALLY CONFIGURED ###

# You may comment out this entry, but any other modifications may be lost.

deb http://dl.google.com/linux/chrome/deb/ stable main



deb http://ppa.launchpad.net/guilhem-fr/swftools/ubuntu precise main

deb-src http://ppa.launchpad.net/guilhem-fr/swftools/ubuntu precise main



deb-src http://ppa.launchpad.net/rabbitvcs/ppa/ubuntu precise main



deb http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu precise main

deb-src http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu precise main



deb http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu precise main

deb-src http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu precise main