.gnupg/gpg-agent.conf

-default-cache-ttl 600
+default-cache-ttl 3600
 max-cache-ttl 7200
 enable-ssh-support
 pinentry-program /usr/bin/pinentry-curses

.gnupg/scdaemon.conf

 reader-port 32768
 pcsc-driver /usr/lib/libpcsclite.so
+
+# Native location for Ubuntu, manually symlinked to above location
+# pcsc-driver /usr/lib/x86_64-linux-gnu/libpcsclite.so
 card-timeout 5
 disable-ccid
+
+# Allow shared use of the card
+pcsc-shared