On an older system with CentOS 7.9, Webmin might fail to update:
Failed to upgrade from www.webmin.com : RPM signature verification failed :
error: rpmdb: BDB0113 Thread/process 22337/140370335274816 failed: BDB1507 Thread died in Berkeley DB library error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db5 - (-30973) error: cannot open Packages database in /var/lib/rpm /tmp/.webmin/718395_24926_2_upgrade.cgi.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#11f63c51)
Solution
# mkdir /var/lib/rpm/backup # mv /var/lib/rpm/__db* /var/lib/rpm/backup/ # rpmdb --rebuilddb