Comment 3 for bug 245219

I see the symptoms while trying to upgrade from 8.04 to 8.10 beta.

root@white:~# update-manager --devel-release &
[1] 6790
root@white:~# extracting 'intrepid.tar.gz'
authenticate 'intrepid.tar.gz' against 'intrepid.tar.gz.gpg'
exception from gpg: GnuPG exited non-zero, with code 131072
Debug information:

gpg: WARNING: unsafe permissions on homedir `/tmp/tmp83J8IK'

gpg: can't open `/tmp/tmp83J8IK/intrepid.tar.gz.gpg'
gpg: verify signatures failed: file open error

[1]+ Done update-manager --devel-release
root@white:~#

On a successful run, I do not get the permissions message.

update-manager-1:0.87.30--all
update-manager-core-1:0.87.30--i386

I removed a local apt-cacher-ng proxy from my configuration, and got past the problem.

Acquire::http { Proxy "http://192.168.1.30:3142"; };

I have not verified the wireshark analysis.