I have a simular bug andmaybe i found a workaround.

1. start the update-manager with sudo update-manager and wait until it crash
2. kopie the prerequists-sources.list from /tmp/NAMECALLEDINCONSOLE into 
/etc/apt/sources.list.d/ as prerequists-sources.list
3. delete the {archiv} part from this file
4. start the update-manager
-- 
Prerequisites download fails if gpg authentication fails on over-aggressive 
caches
https://bugs.launchpad.net/bugs/144920
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