This is the central part of your dpkg output:
Preparing to unpack
.../mariadb-server-core-5.5_5.5.37-0ubuntu0.14.04.1_amd64.deb ...
Unpacking mariadb-server-core-5.5 (5.5.37-0ubuntu0.14.04.1) ...
Selecting previously unselected package mariadb-server-5.5.
Preparing to unpack .../mariadb-server-5.5_5.5.37-0ubuntu0.14.04.1_amd64.deb ...
Aborting downgrade from (at least) 5.6 to 5.5.
If are sure you want to downgrade to 5.5, remove the file
/var/lib/mysql/debian-*.flag and try installing again.
dpkg: error processing archive
/var/cache/apt/archives/mariadb-server-5.5_5.5.37-0ubuntu0.14.04.1_amd64.deb
(--unpack):
subprocess new pre-installation script returned error exit status 1
Selecting previously unselected package mariadb-server.
Preparing to unpack .../mariadb-server_5.5.37-0ubuntu0.14.04.1_all.deb ...
Unpacking mariadb-server (5.5.37-0ubuntu0.14.04.1) ...
Processing triggers for man-db (2.6.6-1) ...
Errors were encountered while processing:
/var/cache/apt/archives/mariadb-server-5.5_5.5.37-0ubuntu0.14.04.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Note the lines:
Aborting downgrade from (at least) 5.6 to 5.5.
If are sure you want to downgrade to 5.5, remove the file
/var/lib/mysql/debian-*.flag and try installing again.
This is by design - the packaging of all MySQL and MariaDB versions 5.1,
5.2, 5.3 etc have this hook built-it that will stop people for
downgrading. The MySQL/MariaDB data files are not promised to be
backwards compatible, thus running a 5.5 version on 5.6 data might lead
to corruption.
Safest way is for you run mysqldump to get your data in pure SQL format,
then remove MySQL 5.6 and install MariaDB.
** Changed in: mariadb-5.5 (Ubuntu)
Status: New => Opinion
** Summary changed:
- Unable to install package mariadb-server-5.5 if mysql-server-5.6 was
installed on Ubuntu 14.04
+ Unable to downgrade automatically to mariadb-server-5.5 if mysql-server-5.6
was installed on Ubuntu 14.04
** Summary changed:
- Unable to downgrade automatically to mariadb-server-5.5 if mysql-server-5.6
was installed on Ubuntu 14.04
+ Unable to downgrade fully automatically to mariadb-server-5.5 if
mysql-server-5.6 was installed
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1330496
Title:
Unable to downgrade fully automatically to mariadb-server-5.5 if
mysql-server-5.6 was installed
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mariadb-5.5/+bug/1330496/+subscriptions
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