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Here's how I install Electrum.
Install pip for Python 2 branch preferably 2.7 (the latest version) - the
package should be called something like python2-pip or python2.7-pip. Then
install the latest version from https://download.electrum.org/ using pip,
e.g.
sudo pip2.7 install https://download.electrum.org/2.9.3/Electrum-2.9.3.tar.gz
(You might need to replace pip2.7 with the command provided by the package
you installed.)
(I'm recommending using the old python2-pip since I failed to install
Electrum using the newer version of pip on Hyperbola. It might work for you
though on Trisquel.)