root@db2:~# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
  linux-image-server linux-server ntfs-3g openssh-client openssh-server postfix postfix-mysql
The following packages will be upgraded:
  libpq5 mysql-server-5.0
2 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.
Need to get 342kB/27.1MB of archives.
After unpacking 81.9kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://old-releases.ubuntu.com gutsy-backports/main libpq5 8.3.3-1~gutsy1 [342kB]
Fetched 342kB in 0s (851kB/s)
Preconfiguring packages ...
(Reading database ... 44868 files and directories currently installed.)
Preparing to replace mysql-server-5.0 5.0.45-1ubuntu3 (using .../mysql-server-5.0_5.0.45-1ubuntu3.4_i386.deb) ...
 * Stopping MySQL database server mysqld
   ...fail!
invoke-rc.d: initscript mysql, action "stop" failed.
dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
 * Stopping MySQL database server mysqld
   ...fail!
invoke-rc.d: initscript mysql, action "stop" failed.
dpkg: error processing /var/cache/apt/archives/mysql-server-5.0_5.0.45-1ubuntu3.4_i386.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
 * Stopping MySQL database server mysqld
   ...fail!
invoke-rc.d: initscript mysql, action "stop" failed.
 * Starting MySQL database server mysqld
   ...done.
/usr/bin/mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'debian-sys-maint'@'localhost' (using password: YES)'
Preparing to replace libpq5 8.2.11-0ubuntu0.7.10 (using .../libpq5_8.3.3-1~gutsy1_i386.deb) ...
Unpacking replacement libpq5 ...
Errors were encountered while processing:
 /var/cache/apt/archives/mysql-server-5.0_5.0.45-1ubuntu3.4_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)