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Setting up a password manager on Linux Mint

Install packages

Open “Passwords and Keys” (seahorse)
Select “GnuPG keys” on the left
Press the “+” symbol in the top left.
Select “GPG key”
Fill in the fields “Full Name,” “Email Address,” and optionally “Comment”
Set the “Encryption Type” to “RSA” and “Key Strength (bits)” to 3072
Press “Create” in the top right.
Input a passphrase for the key in the “Password” and “Confirm” fields. This will be your “master” password.
Your new key should now show up in the list in the main pane of the window.

Decide on backup locations for your key; cloud storage, a dedicated backup drive, etc.
Right click on your newly generated key
Select “Properties” from the context menu.
Click on the hamburger menu in the top left
Select “Export secret key”
Navigate to wherever you want to back up your key.
Make sure the file name makes sense.
Select “Export”
Input your key's passphrase and press “OK.”