Hi, Error as title happened when I'm following http://www.severalnines.com/blog/howto-offline-upgrade-galera-cluster-mysql-... to upgrade from 5.5 to 10.0 Repos /etc/apt/sources.list.d/MariaDB.list deb http://ftp.osuosl.org/pub/mariadb/repo/10.0/ubuntu trusty main /etc/apt/sources.list deb http://my.archive.ubuntu.com/ubuntu/ trusty main restricted deb-src http://my.archive.ubuntu.com/ubuntu/ trusty main restricted deb http://my.archive.ubuntu.com/ubuntu/ trusty-updates main restricted deb-src http://my.archive.ubuntu.com/ubuntu/ trusty-updates main restricted deb http://my.archive.ubuntu.com/ubuntu/ trusty multiverse deb-src http://my.archive.ubuntu.com/ubuntu/ trusty multiverse deb http://my.archive.ubuntu.com/ubuntu/ trusty-updates multiverse deb-src http://my.archive.ubuntu.com/ubuntu/ trusty-updates multiverse deb http://my.archive.ubuntu.com/ubuntu/ trusty-backports main restricted multiverse deb http://security.ubuntu.com/ubuntu trusty-security main restricted deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted deb http://security.ubuntu.com/ubuntu trusty-security multiverse deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse deb http://repo.percona.com/apt trusty main deb-src http://repo.percona.com/apt trusty main Command used $ sudo LC_ALL=en_US.utf8 DEBIAN_FRONTEND=noninteractive apt-get -o Dpkg::Options::='--force-confnew' -y install mariadb-galera-server galer $ sudo dpkg --get-selections | grep maria libmariadbclient18 install mariadb-client-5.5 deinstall mariadb-client-core-5.5 install mariadb-common install mariadb-galera-server-5.5 deinstall $ sudo apt-get remove libmariadbclient18 mariadb-client-5.5 mariadb-client-core-5.5 mariadb-common mariadb-galera-server-5.5 Even after purging those packages I'm still having same error. How to solve this? Any help is appreciated. Ubuntu 14.04