This appears to be fixed in the Karmic package.
** Changed in: monotone (Ubuntu)
Status: New = Fix Released
** Changed in: monotone (Ubuntu)
Assignee: (unassigned) = Zack Weinberg (zackw)
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package monotone-server 0.40-7 failed to install/upgrade: subprocess
post-installation
The monotone-server postinst script expected /var/run not to be a tmpfs.
This has been fixed in the current Debian unstable package (0.43-1).
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package monotone-server 0.40-7 failed to install/upgrade: subprocess
post-installation script returned error exit status 1
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/20581097/Dependencies.txt
** Attachment added: DpkgTerminalLog.gz
http://launchpadlibrarian.net/20581098/DpkgTerminalLog.gz
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package monotone-server 0.40-7 failed to install/upgrade: subprocess
post-installation