GPG issue while running "vagrant up"

following error messages I am getting while running “vagrant up” command on MacBook. Ubuntu server is proisioned and running fine only dont know how to connect to it (user/password).

mongod-m103: GPG error: trusty/mongodb-enterprise/3.6 Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 58712A2291FA4AD5
mongod-m103: W
mongod-m103: :
mongod-m103: GPG error: trusty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
mongod-m103: W
mongod-m103: :
mongod-m103: Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_trusty_main_source_Sources Invalid file format
mongod-m103: E
mongod-m103: :
mongod-m103: Some index files failed to download. They have been ignored, or old ones used instead.


Please follow the below mentioned links for solution:

Please let me know, if you still face any problem.