The easy way to edit that file is to copy the file from that location into an area that you have write access. change the permissions on that file so you have write access. edit the file however you like, then use sudo to copy or move you file to the default location. of course make a backup of the original.
publickey - [email protected] - 0x01EB3346.asc
Description: application/pgp-keys
Description: OpenPGP digital signature
