btw you did download electrum from electrum.org right? if you did that then it's ok. i ask because there are malware copies floating around so you have to make sure you download it from the official site.
This is great advice, i only wanted to add that a second option is to check the signature.
All releases of electrum should be signed by ThomasV
https://pgp.mit.edu/pks/lookup?op=vindex&search=0x2BD5824B7F9470E6
If the signature checks out, it doesn't really matter where you downloaded the release (altough it might be a good idear to download from electrum.org, so you're sure you have the lastest stable release)
Edit
Howto (linux):
wget https[Suspicious link removed]
wget https[Suspicious link removed].asc
gpg --keyserver pgp.mit.edu --recv-keys 0x2BD5824B7F9470E6
gpg --verify electrum-2.8.1-portable.exe.asc
Thanks for the replies, I did download from electrum.org
The cert thing had me worried, not so much now