Disable keyring prompt with autologin

Add instructions to do so.

Guides/install-linux.md

@@ -93,3 +93,9 @@ APT::Periodic::Update-Package-Lists "0";
 ### Copy dot folders
 
 Like _.thunderbird_, _.mozilla_, _.ssh_
+
+### Disable keyring password prompt with autologin
+
+Launch _seahorse_ and set a blank keyring password.
+
+**Warning: this will put your keyring as unencrypted**