3 1/2 years later ... still affecting Raring.
$ sudo dpkg -i ../simple-scan_3.8.0-0ubuntu2~tj_amd64.deb [sudo] password for tj: dpkg-split: error: unable to read part file `../simple-scan_3.8.0-0ubuntu2~tj_amd64.deb': Permission denied dpkg: error processing ../simple-scan_3.8.0-0ubuntu2~tj_amd64.deb (--install): subprocess dpkg-split returned error exit status 2 Errors were encountered while processing: ../simple-scan_3.8.0-0ubuntu2~tj_amd64.deb
$ ls -l ../simple-scan_3.8.0-0ubuntu2~tj_amd64.deb -rw------- 1 tj tj 242276 Jul 17 17:13 ../simple-scan_3.8.0-0ubuntu2~tj_amd64.deb
$ umask 0002 $ touch ../test-umask.tmp $ ls -l ../test-umask.tmp -rw-rw-r-- 1 tj tj 0 Jul 17 17:20 ../test-umask.tmp
3 1/2 years later ... still affecting Raring.
$ sudo dpkg -i ../simple- scan_3. 8.0-0ubuntu2~ tj_amd64. deb scan_3. 8.0-0ubuntu2~ tj_amd64. deb': Permission denied scan_3. 8.0-0ubuntu2~ tj_amd64. deb (--install): scan_3. 8.0-0ubuntu2~ tj_amd64. deb
[sudo] password for tj:
dpkg-split: error: unable to read part file `../simple-
dpkg: error processing ../simple-
subprocess dpkg-split returned error exit status 2
Errors were encountered while processing:
../simple-
$ ls -l ../simple- scan_3. 8.0-0ubuntu2~ tj_amd64. deb scan_3. 8.0-0ubuntu2~ tj_amd64. deb
-rw------- 1 tj tj 242276 Jul 17 17:13 ../simple-
$ umask
0002
$ touch ../test-umask.tmp
$ ls -l ../test-umask.tmp
-rw-rw-r-- 1 tj tj 0 Jul 17 17:20 ../test-umask.tmp