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

5 Great Commands to Monitor Network Bandwidth

Commands to Monitor Network Bandwidth

5 Great Commands to Monitor Network Bandwidth on Linux Server   Linux network traffic monitoring is one of the main parts of Linux troubleshooting. And can be done by many network monitoring utilities. In this article we will discover 5… Continue Reading

Ubuntu 18.04 LTS Set Hostname Permanently

Ubuntu 18.04 LTS Set Hostname Permanently   In this article I will show how to set hostname in Ubuntu server 18.04 permanently. Lets say my server old hostname is: serv and should be changed to: serv1. Ubuntu Server 18.04 Set… Continue Reading