The fact that it's rewriting the partition table on /dev/sda at all in
this case is a bug that might be fixed either in partman-base (by making
SET_FLAGS not mark the partition table as changed when the new flags are
the same as the old ones) or partman-basicmethods (by not sending the
SET_FLAGS command at all in the case where it won't do anything). I lean
towards the latter, which is nice and simple and furthermore more
efficient anyway. I think it's worth getting this fixed in 9.10, as
having partition tables spuriously rewritten does tend to alarm people
even if no data loss is involved.

The fact that partition boot records appear to be getting lost in the
process can, I think, only be a parted bug. partman certainly isn't
intentionally telling it to do this.

** Package changed: ubiquity (Ubuntu) => partman-basicmethods (Ubuntu)

** Also affects: parted (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: parted (Ubuntu Karmic)
   Importance: Undecided
       Status: New

** Also affects: partman-basicmethods (Ubuntu Karmic)
   Importance: Undecided
       Status: New

** Changed in: partman-basicmethods (Ubuntu Karmic)
   Importance: Undecided => Medium

** Changed in: partman-basicmethods (Ubuntu Karmic)
    Milestone: None => ubuntu-9.10

** Changed in: partman-basicmethods (Ubuntu Karmic)
     Assignee: (unassigned) => Colin Watson (cjwatson)

** Changed in: partman-basicmethods (Ubuntu Karmic)
       Status: New => Fix Committed

-- 
ubiquity overwrites VBR of extended partition
https://bugs.launchpad.net/bugs/445067
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