Verified with the proposed package for natty. Reproducing the problem (using a lucid test repository to trigger the 401, it doesn't matter that it's not natty): root@li37-87:~# smart update aptsync-4256fab382bd1817c0c8c568a38ae5ea Loading cache... Updating cache... ########################################################################################## [100%] Fetching information for 'lucid - main'... -> https://ahasenack:*@private-ppa.launchpad.net/landscape/landscape-testing/ubuntu/dists/lucid/Release.gpg Release.gpg ########################################################################################## [ 33%] -> https://ahasenack:*@private-ppa.launchpad.net/landscape/landscape-testing/ubuntu/dists/lucid/Release Release ########################################################################################## [ 66%] error: Channel 'lucid - main' signed with unknown key Updating the package: root@li37-87:~# apt-get install smartpm-core python-smartpm Reading package lists... Done Building dependency tree Reading state information... Done smartpm-core is already the newest version. The following packages were automatically installed and are no longer required: python-psycopg2 python-egenix-mxdatetime python-egenix-mxtools libpq5 Use 'apt-get autoremove' to remove them. The following packages will be upgraded: python-smartpm 1 upgraded, 0 newly installed, 0 to remove and 4 not upgraded. Need to get 285 kB of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? Get:1 http://security.ubuntu.com/ubuntu/ natty-proposed/main python-smartpm i386 1.3-1.3ubuntu0.2 [285 kB] Fetched 285 kB in 0s (384 kB/s) (Reading database ... 28103 files and directories currently installed.) Preparing to replace python-smartpm 1.3-1.3ubuntu0.1 (using .../python-smartpm_1.3-1.3ubuntu0.2_i386.deb) ... Unpacking replacement python-smartpm ... Processing triggers for python-support ... Setting up python-smartpm (1.3-1.3ubuntu0.2) ... Processing triggers for python-support ... Trying smart again, now we get a nice 401 error: root@li37-87:~# smart update aptsync-4256fab382bd1817c0c8c568a38ae5ea Loading cache... Updating cache... ########################################################################################## [100%] Fetching information for 'lucid - main'... -> https://ahasenack:*@private-ppa.launchpad.net/landscape/landscape-testing/ubuntu/dists/lucid/Release.gpg Release.gpg [ 0%] -> https://ahasenack:*@private-ppa.launchpad.net/landscape/landscape-testing/ubuntu/dists/lucid/Release Release [ 0%] error: Download of Release failed for channel 'lucid - main': The requested URL returned error: 401