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Assuming you properly added the repository as I described previously, you should close Synaptic (and Software Center), then reopen Synaptic.
Press the 'reload' button at the top of the app. Wait while the package information downloads (it's refreshing the list of available apps.)
Once that's done, type 'sigil' into the Quick Search text box at the top of the app.
If it shows up in the window below, then click the checkbox next to it if the checkbox is empty. If it's not empty, then Sigil is installed -- you should close Synaptic and search the launch menu for Sigil.
If it was empty, and you clicked it, you'll get a popup menu. Choose 'Mark for installation'. (It will be greyed out if Sigil is already installed.) Push the 'Mark' button on the popup dialog that comes (if Sigil has one -- some apps require additional support files -- Sigil may or may not, depending on what has been installed already).
Then click the 'Apply' button at the top. A dialog will open asking for confirmation -- click the 'Apply' button in the dialog. You'll see two dialogs, one showing the package download and one showing Sigil being installed. Wait until the second one disappears and the Synaptic window refreshes.
Close Synaptic and search your launch menu.
If none of that works, please take a screenshot of Synaptic with 'sigil' in the Quick Search box and a screenshot of the dialog box that pops up when you follow: Settings --> Repositories -->Other Software
Aloha.
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