Configuration file '/etc/ssh/ssh_config'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** ssh_config (Y/I/N/O/D/Z) [default=N] ? Y


48 installed packages are no longer supported by Canonical. You can 
still get support from the community. 

125 packages are going to be removed. 635 new packages are going to 
be installed. 2545 packages are going to be upgraded. 

You have to download a total of 3,929 M. This download will take 
about 8 hours with a 1Mbit DSL connection and about 6 days 8 hours 
with a 56k modem. 

Fetching and installing the upgrade can take several hours. Once the 
download has finished, the process cannot be canceled. 

 Continue [yN]  Details [d]y

Lock screen disabled 

Your lock screen has been disabled and will remain disabled until you 
reboot. 


----------
Errors were encountered while processing:
 update-notifier-common
E: Sub-process /usr/bin/dpkg returned an error code (1)

Could not calculate the upgrade 

An unresolvable problem occurred while calculating the upgrade. 

This was likely caused by: 
* Unofficial software packages not provided by Ubuntu 
Please use the tool 'ppa-purge' from the ppa-purge 
package to remove software from a Launchpad PPA and 
try the upgrade again. 

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
you want to investigate this yourself the log files in 
'/var/log/dist-upgrade' will contain details about the upgrade. 
Specifically, look at 'main.log' and 'apt.log'. 


Restoring original system state

Aborting