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Is anyone getting this error?
Failed to fetch http://downloads.sourceforge.net/project/ubuntuzilla/mozilla/apt/dists/all/main/binary-i386/Packages.gz Got a single header line over 360 chars
I just changed to switch.dl.sourceforge.net and it looks like I'm able to do an upgrade.
Changing APT source in /etc/apt/sources.list to suggested location worked for me also.