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$ sudo su
$ echo "deb http://repo.sinew.in/ stable main" > \
  /etc/apt/sources.list.d/enpass.list
And import key that is used to sign the release:

$ wget -O - http://repo.sinew.in/keys/enpass-linux.key | apt-key add -
After that you can install Enpass as any other software package:

$ apt-get update
$ apt-get install enpass