Having this error in update manager in Linux Mint 17.1 LTS, kernel 4.4.0-78 :W: GPG error: http://deb.bitmask.net/debian xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1E34A1828E207901
W: The repository 'http://deb.bitmask.net/debian xenial InRelease' is not signed.
I'm using Bitmask black application with Leap Encryption Access.
Please let me know how can I fix it.
Thanks in advance for your help.
Doudou,