After upgrading my Kubuntu 13.10 with a working Sigil on it, I tried to find the PPA again for the 14.04. However I got an error 404 with the sunil ppa-address. So I searched quite a while and got at last a reslult in the french Ubuntu Users Forum.
The correct ppa address is now
Code:
ppa:sunab/sigil-git
I installed without any problems and a quick check showed me it works. However I have not tested it in any depths.
Please do not use this PPA, but the one in contribution #5.