Ubuntu更新高版本MariaDB

备份数据库：

mysqldump -u root dbname > dbname_backup.sql

添加官方repo：

wget https://r.mariadb.com/downloads/mariadb_repo_setup

echo "935944a2ab2b2a48a47f68711b43ad2d698c97f1c3a7d074b34058060c2ad21b  mariadb_repo_setup" \
       | sha256sum -c -

chmod +x mariadb_repo_setup

sudo ./mariadb_repo_setup

强制升级：

sudo apt update
sudo apt -u dist-upgrade