у меня была эта проблема при установке mysql-сервера

sudo apt install mysql-server
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libllvm7 linux-headers-4.15.0-45 linux-headers-4.15.0-45-generic
  linux-image-4.15.0-45-generic linux-modules-4.15.0-45-generic
  linux-modules-extra-4.15.0-45-generic
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
  mysql-server
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 9,944 B/3,203 kB of archives.
After this operation, 110 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 mysql-server all 5.7.26-0ubuntu0.18.04.1 [9,944 B]
Fetched 9,944 B in 1s (14.9 kB/s)       
Selecting previously unselected package mysql-server.
(Reading database ... 214209 files and directories currently installed.)
Preparing to unpack .../mysql-server_5.7.26-0ubuntu0.18.04.1_all.deb ...
Unpacking mysql-server (5.7.26-0ubuntu0.18.04.1) ...
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.7; however:
  Package mysql-server-5.7 is not installed.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                          Errors were encountered while processing:
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)