the suggested workaround worked only for create command. Still produces following error messages with build.
cp: cannot create hard link `/var/cache/pbuilder/build//cow.32008/usr/share/man/man1/bzexe.1.gz' to `/home/juhapekka/pbuilder/quantal-base.cow/usr/share/man/man1/bzexe.1.gz': Invalid cross-device link
the suggested workaround worked only for create command. Still produces following error messages with build.
cp: cannot create hard link `/var/cache/ pbuilder/ build// cow.32008/ usr/share/ man/man1/ bzexe.1. gz' to `/home/ juhapekka/ pbuilder/ quantal- base.cow/ usr/share/ man/man1/ bzexe.1. gz': Invalid cross-device link