Can you try stopping/killing all mysql processes prior to purging them? It looks like the old process was still running, and it made the reinstallation fail to configure.
** Changed in: mysql-8.0 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1941842 Title: package mysql-server-8.0 8.0.26-0ubuntu0.20.04.2 failed to install/upgrade: installed mysql-server-8.0 package post-installation script 서브프로세스가 오류 종료 상태 1를 반환했습니다 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mysql-8.0/+bug/1941842/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs