It seems to be a debconf problem.
The following exists with exit code 10:
LANG=C DEBCONF_DEBUG=developer sudo debconf /var/lib/dpkg/info/grub-pc.postinst
configure
LANG=C sudo debconf --frontend=readline /var/lib/dpkg/info/grub-pc.postinst
configure
But this one succeeds (notice the additional "sh"):
LANG=C sudo debconf --frontend=readline sh /var/lib/dpkg/info/grub-pc.postinst
configure
** Also affects: debconf (Ubuntu)
Importance: Undecided
Status: New
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package samba-common 2:3.4.0-3ubuntu5.1 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 10
https://bugs.launchpad.net/bugs/492257
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