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apt update
apt upgrade

Rollback

As mentioned here, the root partition is in LVM disk. With this configuration, it can be save by a LVM snapshot.

lvcreate -L SIZE -s -n SNAPSHOT_NAME /dev/VOLUME_GROUP/DISK_NAME

With snapshots, the partition can be rollback in the stable state with this command:

lvconvert --merge /dev/VOLUME_GROUP/SNAPSHOT_NAME

Otherwise, the snapshot can be remove with these commands:

lvremove /dev/VOLUME_GROUP/SNAPSHOT_NAME

More details here.

Troubleshooting

Can't create a snapshot with old name

If you don't resboot the machine, the lvcreate command believes the name is always used. To remove it, you need to launch this command:

vgchange --refresh

Supervision

VM Backups

Node replacement