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I'm setting up an environment to install many Lenny machines at once and I need to avoid any dialog with the process, corner cases aside. One thing that consistently troubles me is that after my preseeded disk recipe creates Linux RAID-1 devices, the installer warns me about how the kernel could not re-read the partition table on each MD device. When I do a manual installation and try to use debconf-get-selections to preseed another installation, it seems to ignore the whole preseed file altogether. But reading through those selections, I couldn't find anything that seemed to suggest it would select "OK" on this extraneous warning.

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I haven't tried on Lenny, but in Debian Squeeze preseed+raid is totally broken. I would guess you might need to work around that. – chrishiestand Aug 18 '11 at 8:26
Well... that's really bad. – andyortlieb Aug 22 '11 at 15:47
Yeah, the partman preseed stuff could use some extra love. preseed is pretty awesome and I really appreciate the work they've done on it. – chrishiestand Aug 26 '11 at 2:50
dimmer, In case you're curious, I copied /dev/mem and searched for the warning message and from that I was able to discover the correct preseed answer. – andyortlieb Oct 17 '11 at 2:43
Excellent, thank you. I will have to give that a try next time. – chrishiestand Oct 20 '11 at 7:54
up vote 1 down vote accepted

For anybody else stuck on this issue, you can use the following line in your preseed file:

d-i partman/exception_handler_note note

But you'll want to be aware of the implied risks.

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