GPG error: http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 4F4EA0AAE5267A6C

The following signatures couldn't be verified

To fix Ubuntu 16.04 error: GPG error: http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 4F4EA0AAE5267A6C run: # apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 4F4EA0AAE5267A6C Sample output:     If you like… Continue Reading

5 Great Linux Disk IO monitoring tools

5 Great Linux Disk IO monitoring tools

5 Great Linux Disk IO monitoring tools Below you see my favorite best 5 Linux Disk IO Monitoring Tools.   IOTOP iotop Linux is a simple top-like disk I/O monitor tool. iotop command watches I/O usage information output by the… Continue Reading