Package Upgrade Broke MySQL

[Craige McWhirter]

When the percona-galera-3 was updated, it resulted in the following error:

2017-12-15 19:52:15 231664 [Note] WSREP: Read nil XID from storage engines, skipping position init
2017-12-15 19:52:15 231664 [Note] WSREP: wsrep_load(): loading provider library '/usr/lib/libgalera_smm.so'
2017-12-15 19:52:15 231664 [ERROR] WSREP: provider interface version mismatch: need '25', found '26'
2017-12-15 19:52:15 231664 [ERROR] WSREP: wsrep_load(): interface version mismatch: my version 25, provider version 26
2017-12-15 19:52:15 231664 [ERROR] WSREP: wsrep_load(/usr/lib/libgalera_smm.so) failed: Invalid argument (22). Reverting to no provider.
2017-12-15 19:52:15 231664 [Note] WSREP: Read nil XID from storage engines, skipping position init
2017-12-15 19:52:15 231664 [Note] WSREP: wsrep_load(): loading provider library 'none'
2017-12-15 19:52:15 231664 [ERROR] Aborting

MySQL as unable to be started until percona-xtrabackup and percona-xtradb-cluster-server-5.6 packages were manually updated.

It appears that the percona-galera-3 upgrade happened to unattended upgrades on the security channel.

Perhaps these packages ought to be more tightly version dependent?