on Ubuntu 17.04 there seems to be an issue with v2.5.3 GUI
nothing to see there
(rebooted and still the same...)
v2.5.3 runs fine on Ubuntu 15.10, I'll try it on the latest 17.10 if I find a minute later on.
Did you check the hash of your download? If you've never done it, run the following commands in a terminal:
cd /home/ewibit/Downloads
or wherever you downloaded the deb package, then
sha256sum iota_2.5.3_amd64.deb
You should get the following hash:
649d22bb0d31cbf0d5015bb5b69c765fad5822f12b407311a8a9ed82cd7a53e3
https://github.com/iotaledger/wallet/releases/