我一直收到此错误，并且我无法删除任何内容，dpkg返回错误。
包装配置
┌─────────────────────┤ Configuring postgresql-common ├─────────────────────┐
│ │
│ Obsolete major version 11
│
│ The PostgreSQL version 11 is obsolete, but the server or client packages
│ are still installed. Please install the latest packages (postgresql-12
│ and postgresql-client-12) and upgrade the existing clusters with
│ pg_upgradecluster (see manpage).
│
│ Please be aware that the installation of postgresql-12 will
│ automatically create a default cluster 12/main. If you want to upgrade
│ the 11/main cluster, you need to remove the already existing 12 cluster
│ (pg_dropcluster --stop 12 main, see manpage for details).
│
│ The old server and client packages are no longer supported. After the
│ existing clusters are upgraded, the postgresql-11 and
│ postgresql-client-11 packages should be removed.
│
│ Please see /usr/share/doc/postgresql-common/README.Debian.gz for