@darkbreath:
Spotted something that might help. I'm assuming you're using the 64-bit version of Ubuntu. I'm pretty sure there is no 32-bit version of sigil available.
Run synaptic as root (sudo synaptic). When it comes up, look at the far left margin, second line from the top, and click the button/bar labeled "Reload". This will reload and rebuild a fresh, updated copy of the latest xapian index. It should download a couple dozen files and then sort them for xapian. Once that settles down you can click the "Search" button/bar at the top right to search for sigil, or you can click the button/bar at the left margin close to the bottom labeled "Status" and then "Installed (upgradable)" and visually search for "sigil". This will also show you what else (not necessarily related to sigil) is waiting to be upgraded.
Right click the program(s) you want to update and mark them for update. Then, at the top, left-click "Apply" and wait for it to complete.
This will remove the need to run "sudo apt-get update" and rebuild the index by hand.
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