This turned up after Buildbot was upgraded to the official Ubuntu "lucid" 10.04 release.

Looks like the official MySQL packages in 10.04 has some stuff split out into a new package "mysql-client-core-5.1" that we need to handle dependencies on (conflicts/replaces/provides/whatever?)

https://buildbot.askmonty.org/buildbot/builders/kvm-deb-lucid-amd64/builds/161

+ sudo sh -c 'DEBIAN_FRONTEND=noninteractive apt-get install --allow-unauthenticated -y mariadb-server'
Reading package lists...
Building dependency tree...
Reading state information...
The following packages were automatically installed and are no longer required:
mysql-client-core-5.1
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
libmariadbclient16 libmysqlclient16 mariadb-client-5.1 mariadb-server-5.1
mariadb-server-core-5.1 mysql-common
Suggested packages:
tinyca mailx mariadb-test
The following packages will be REMOVED:
mysql-client-5.1 mysql-server-5.1 mysql-server-core-5.1
The following NEW packages will be installed:
libmariadbclient16 mariadb-client-5.1 mariadb-server mariadb-server-5.1
mariadb-server-core-5.1
The following packages will be upgraded:
libmysqlclient16 mysql-common
2 upgraded, 5 newly installed, 3 to remove and 250 not upgraded.
Need to get 0B/18,0MB of archives.
After this operation, 13,6MB disk space will be freed.
WARNING: The following packages cannot be authenticated!
mysql-common libmysqlclient16 libmariadbclient16 mariadb-client-5.1
mariadb-server-core-5.1 mariadb-server-5.1 mariadb-server
Preconfiguring packages ...
Authentication warning overridden.
(Reading database ... 41407 files and directories currently installed.)
Removing mysql-server-5.1 ...
mysql stop/waiting
Removing mysql-client-5.1 ...
Removing mysql-server-core-5.1 ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
(Reading database ... 41198 files and directories currently installed.)
Preparing to replace mysql-common 5.1.41-3ubuntu12 (using .../mysql-common_5.1.44a-mariadb78_all.deb) ...
Unpacking replacement mysql-common ...
Preparing to replace libmysqlclient16 5.1.41-3ubuntu12 (using .../libmysqlclient16_5.1.44a-mariadb78_amd64.deb) ...
Unpacking replacement libmysqlclient16 ...
Selecting previously deselected package libmariadbclient16.
Unpacking libmariadbclient16 (from .../libmariadbclient16_5.1.44a-mariadb78_amd64.deb) ...
Selecting previously deselected package mariadb-client-5.1.
Unpacking mariadb-client-5.1 (from .../mariadb-client-5.1_5.1.44a-mariadb78_amd64.deb) ...
dpkg: error processing /home/buildbot/buildbot/debs/binary/mariadb-client-5.1_5.1.44a-mariadb78_amd64.deb (--unpack):
trying to overwrite '/usr/share/man/man1/mysqlcheck.1.gz', which is also in package mysql-client-core-5.1 0:5.1.41-3ubuntu12
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Selecting previously deselected package mariadb-server-core-5.1.
Unpacking mariadb-server-core-5.1 (from .../mariadb-server-core-5.1_5.1.44a-mariadb78_amd64.deb) ...
Processing triggers for man-db ...
Errors were encountered while processing:
/home/buildbot/buildbot/debs/binary/mariadb-client-5.1_5.1.44a-mariadb78_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Command exit 100