I came across this while also trying to set up a 2-drive RAID1 with a spare. Weird that this has been opened this long.
I looked through documentation as well as partman source (learned spares is 7th argument) and realized this is not a bug, just wrong syntax on your part. The spare has to be put in its own separate list, so just add a space instead of a # for your last drive/spare device(s) thereby separating it from the devices meant for the array, e.g.: ''' 1 2 1 ext4 / /dev/sda1#/dev/sdb1 /dev/sde1 ''' >From the Partman Wiki: <raidtype> <devcount> <sparecount> <fstype> <mountpoint> <devices> <sparedevices> Hope this helps whoever googles this next time. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1006805 Title: RAID1 with spare preseed error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/preseed/+bug/1006805/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs