Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
mysql-client-5.0 mysql-server-5.0
2 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/36.3MB of archives.
After this operation, 43.5MB of additional disk space will be used.
Do you want to continue [Y/n]?
Preconfiguring packages ...
(Reading database ... 277565 files and directories currently installed.)
Preparing to replace mysql-client-5.0 5.0.37-5103gg2 (using
.../mysql-client-5.0_5.0.51a-3ubuntu5.1_amd64.deb) ...
Unpacking replacement mysql-client-5.0 ...
dpkg: error processing
/var/cache/apt/archives/mysql-client-5.0_5.0.51a-3ubuntu5.1_amd64.deb
(--unpack):
trying to overwrite `/usr/share/man/man8/mysqlmanager.8.gz', which is
also in package mysql-server-5.0
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Preparing to replace mysql-server-5.0 5.0.37-5103gg2 (using
.../mysql-server-5.0_5.0.51a-3ubuntu5.1_amd64.deb) ...
* MySQL manager or server PID file could not be found!
Unpacking replacement mysql-server-5.0 ...
dpkg: error processing
/var/cache/apt/archives/mysql-server-5.0_5.0.51a-3ubuntu5.1_amd64.deb
(--unpack):
trying to overwrite `/usr/bin/msql2mysql', which is also in package
mysql-client-5.0
dpkg-deb: subprocess paste killed by signal (Broken pipe)
* MySQL manager or server PID file could not be found!
Errors were encountered while processing:
/var/cache/apt/archives/mysql-client-5.0_5.0.51a-3ubuntu5.1_amd64.deb
/var/cache/apt/archives/mysql-server-5.0_5.0.51a-3ubuntu5.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Sorry, I initially confirmed this for hardy, but on closer inspection the file conflicts don't appear to apply to any versions of the packages in the Ubuntu archive; marking invalid instead.
As a workaround, you can forcibly install using dpkg --force-overwrite.