Preparing to unpack .../0-mariadb-common_1%3a10.3.29+maria~bionic_all.deb ...
Unpacking mariadb-common (1:10.3.29+maria~bionic) over (1:10.3.29-0ubuntu0.20.04.1) ...
Preparing to unpack .../1-mariadb-server_1%3a10.3.29+maria~bionic_all.deb ...
Unpacking mariadb-server (1:10.3.29+maria~bionic) over (1:10.3.29-0ubuntu0.20.04.1) ...
Selecting previously unselected package libmariadb3:amd64.
Preparing to unpack .../2-libmariadb3_1%3a10.3.29+maria~bionic_amd64.deb ...
Unpacking libmariadb3:amd64 (1:10.3.29+maria~bionic) ...
Selecting previously unselected package libtinfo5:amd64.
Preparing to unpack .../3-libtinfo5_6.2-0ubuntu2_amd64.deb ...
Unpacking libtinfo5:amd64 (6.2-0ubuntu2) ...
Selecting previously unselected package libncurses5:amd64.
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Unpacking libncurses5:amd64 (6.2-0ubuntu2) ...
dpkg: regarding .../5-mariadb-client-core-10.3_1%3a10.3.29+maria~bionic_amd64.deb containing mariadb-client-core-10.3:
 mariadb-client-10.3 conflicts with mysql-client-core-5.5
  mariadb-client-core-10.3 provides mysql-client-core-5.5 and is to be installed.

dpkg: error processing archive /tmp/apt-dpkg-install-ZUu2tk/5-mariadb-client-core-10.3_1%3a10.3.29+maria~bionic_amd64.deb (--unpack):
 conflicting packages - not installing mariadb-client-core-10.3