Just look for the repository entry and delete it from the file. sudo nano /etc/apt/sources.list Optionally one can remove repository using add-apt-repository command sudo add-apt-repository -r ppa:PPA_REPOSITORY_NAME/PPA To delete repository key, fist list them and fine the problematic one. sudo
How to install the GNU C++ compiler and GNU make
build-essential contains a list of packages including gcc compiler, make and other required tools. $ sudo apt-get update $ sudo apt-get upgrade $ sudo apt-get install build-essential https://help.ubuntu.com/community/InstallingCompilers
How to add HTTPS to your website free
Here are some useful link. Hope that soon will have time to upgrade 🙂 https://letsencrypt.org/getting-started/ https://gethttpsforfree.com/ https://sucuri.net/guides/how-to-install-ssl-certificate How to get FREE SSL Certificate for Website (HTTPS)
Adding Linux Directory ot PATH
PATH is one the environment variables in Linux that stores the directories/paths in where the operation system is looking for executable files. It’s very similar in Windows. Note: For some reasons the current directory is not included in the
Which process is listening on a port on Windows
Type in Command Prompt netstat -a -b
How to remove old kernel to clean up boot folder
The problem is that the old kernels take place in boot folder and cause problems with installetion of new packeges and system upgrade. Probably the easiest way is to use purge-old-kernels script. 1. First install it. sudo apt install byobu
How to empty trash using terminal
The easiest and elegant way is to use the command trash-empty First need to install trash-cli sudo apt-get install trash-cli
SSH Tunneling
Very often and need to transfer files from machines behind firewall and in local virtual network. SSH tunneling in very simple way to do that. ssh -f username@remote.com -L 2222:internalIP:22 -N then I might user SFTP to localhost:2222
WordPress e-mail support
The issue was fixed by using WP Mail SMTP plugin https://wordpress.org/plugins/wp-mail-smtp/ and proper settingshttp://www.wpbeginner.com/plugins/how-to-send-email-in-wordpress-using-the-gmail-smtp-server/
How to increase swap space
Very simple and useful tutorial how to increase swap space. Source: http://askubuntu.com/questions/178712/how-to-increase-swap-space creat .img file sudo dd if=/dev/zero of=/swap.img bs=1M count=1000 note!: bs=1M count=1000 ==> 1GB (bs * count = size in megabytes ) other example : sudo dd if=/dev/zero