Hello, pbuilder fails if TMPDIR is set to a subdirectory of /tmp (for instance, libpam-tmpdir configures per-user temporary directory, like TMPDIR=/tmp/user/0) This is quite trick to diagnose, because dpkg-deb log is missleading: I guess the easiest way to solve the issue would be reset the value of TMPDIR (and TMP to be on the safe side). Regards, Franklin