I've had this bug in 15.04 and fixed it by manually downloading sourceforge files and placing them in an appropriate directory with "sudo cp ~/Downloads/andale32.exe /var/lib/update-notifier/package-data-downloads/partial/andale32.exe".
I've had this bug in 15.04 and fixed it by manually downloading sourceforge files and placing them in an appropriate directory with "sudo cp ~/Downloads/ andale32. exe /var/lib/ update- notifier/ package- data-downloads/ partial/ andale32. exe".