VirtualBox Ubuntu Shared Folder

Once you shared a folder in VirtualBox with Ubuntu Guest, you need to install VirtualBox Guest additions, this can be done from menu.

Once this is done, in your Guest OS, you will see a CD rom, install the provided software.

Before you can use shared folder, you need to add the user you use to group vboxsf, to do this, run following command in terminal.

$USER is user name of the user you will be using. You can replace it with any user you will be using to access the shared folder.

Ubuntu pure-ftpd reply with unroutable address

On AWS Ubuntu server running pure-ftpd, when i try connecting, i get error

To fix this, run

YOUR_PUBLIC_IP_HERE = Replace with your Elastic IP or Public IP (if you don’t have an Elastic IP).

Restart pure-ftpd

On AWS security groups, you need to open following ports


ISPConfig reset admin password

To reset password for ISPConfig, login to MySQL as root.

if you don’t have MySQL root password, see ISPConfig Find MySQL root password.

Switch to ISPConfig database

To change password, run

Replace NEW_PASSWORD_HERE with your new password.

Visual Code Studio Tab key not working

When pressing TAB key, no tab get inserted. It switch to UI, selecting “Explorer” in the side menu. Pressing tab again switch the selection to other UI elements.

I have to close the Visual Code Studio to get tab working again.

To fix this, press

This is keybinding for editor.action.toggleTabFocusMode, it allow switching TAB focus.

Aria engine is not enabled or did not start

When starting MaraDB, i got error

To fix error, remove the file


Git Ignore file Permission (chmod)

Some times when you transfer file to web server, you may need a differnt file permission for files to run in web server, if your code is in git, this make the files marked as modified eventhough file contents are the same. To avoid git checking for file permission (chmod), run following command

Whitelist an IP in Amazon AWS security group from command line

To white list an IP in Amazon AWS security group using aws command line tool, run



Apache Performance Tuning

To optimize Apache web server, run

Gitlab find version

To find version of hosted Gitlab installation, run