When setting up my standard wallet with Electrum, I am given a seed, which I record, then I am asked for a password to encrypt it. When I go back into the new wallet after logging out, I am asked for my password and can then view my seed. Yet we are advised not to store the seed on computer.Is that safe?  The wallet's security is entirely dependent on the password and encryption.  If I then store that wallet offline, would it still be vulnerable when connecting to transact? Is there any good way around this? Please spell it out, I'm a noob.

I am trying to verify Electrum for Linux downloaded from the Electrum website and got the following:

sudo gpg --verify Electrum-3.3.4.tar.gz.asc
gpg: WARNING: unsafe ownership on homedir '/home/me/.gnupg'
gpg: assuming signed data in 'Electrum-3.3.4.tar.gz'
gpg: Signature made Wed 13 Feb 2019 22:08:29 GMT
gpg:                using RSA key 6694D8DE7BE8EE5631BED9502BD5824B7F9470E6
gpg: Good signature from "Thomas Voegtlin (https://electrum.org) <thomasv@electrum.org>" [unknown]
gpg:                 aka "ThomasV <thomasv1@gmx.de>" [unknown]
gpg:                 aka "Thomas Voegtlin <thomasv1@gmx.de>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 6694 D8DE 7BE8 EE56 31BE  D950 2BD5 824B 7F94 70E6

What do I do?