apt error after MariaDB to MySQL change
I have install MariaDB on a Ubuntu 16.04 server. Then installed Virtualmin, that require MySQL, so it removed MariaDB and installed MySQL, this caused apt stop working.
When i run “apt update”, it failed with
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root@ok-vm:~# apt upgrade Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies: mysql-server : Depends: mysql-server-5.7 but it is not installed E: Unmet dependencies. Try using -f. root@ok-vm:~# |
Next i run ‘apt-get -f install’ as it said in above error message.
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root@ok-vm:~# apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following additional packages will be installed: mysql-server-5.7 Suggested packages: mailx tinyca The following NEW packages will be installed: mysql-server-5.7 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. 167 not fully installed or removed. Need to get 0 B/2,708 kB of archives. After this operation, 48.3 MB of additional disk space will be used. Do you want to continue? [Y/n] Y Preconfiguring packages ... (Reading database ... 120876 files and directories currently installed.) Preparing to unpack .../mysql-server-5.7_5.7.20-0ubuntu0.16.04.1_amd64.deb ... Aborting downgrade from (at least) 10.0 to 5.7. If are sure you want to downgrade to 5.7, remove the file /var/lib/mysql/debian-*.flag and try installing again. dpkg: error processing archive /var/cache/apt/archives/mysql-server-5.7_5.7.20-0ubuntu0.16.04.1_amd64.deb (--unpack): subprocess new pre-installation script returned error exit status 1 Errors were encountered while processing: /var/cache/apt/archives/mysql-server-5.7_5.7.20-0ubuntu0.16.04.1_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) root@ok-vm:~# |
That too failed. The error message is
Preparing to unpack …/mysql-server-5.7_5.7.20-0ubuntu0.16.04.1_amd64.deb …
Aborting downgrade from (at least) 10.0 to 5.7.
This is because MySQL detected MairaDB data files in /var/lib/mysql folder, it can’t use same data files as MariaDB is newer version.
To fix the problem, i renamed the folder
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mv /var/lib/mysql /var/lib/mysql-old |
Now running “apt-get -f install” fixed the problem with apt.
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apt-get -f install |