Step by step guide to install Postfix Ubuntu + Postfix + Courier/Dovecot IMAP + MySQL + Amavisd-new + SpamAssassin + ClamAV + SASL + TLS + Roundcube + Postgrey Easy to follow howto on setting up a mail server with
Gnome: Hide mounted drives in favorites
gsettings set org.gnome.shell.extensions.dash-to-dock show-mounts false
Create a bootable USB of Windows PE on linux
How can I create a bootable USB using Windows PE ISO on linux? The Hiren’s BootCD PE contains both BIOS and UEFI loaders. You can therefore simply copy the contents of the ISO onto a suitably formatted USB key. The
virt-edit – Edit a file in a KVM virtual machine
DESCRIPTION virt-edit is a command line tool to edit file where each file exists in the named virtual machine (or disk image). Multiple filenames can be given, in which case they are each edited in turn. Each filename must be
How to flush the DNS cache on Ubuntu Server
What you’ll need The only thing you’ll need to flush the DNS cache on your Ubuntu Server is a user with sudo privileges. With that user at the ready, let’s get to the flushing. How to flush your DNS cache
How can I reboot a server with systemctl if systemctl reboot fails?
I got Failed to start reboot.target: Connection timed out for my systemctl –force rebootTo ensure that the system will reboot no matter what, I always do this sequence: This requests the kernel to do: Emergency sync of the block devicesMount
Install and Use Btrfs on Ubuntu 20.04 LTS
Btrfs (B-Tree Filesystem) is a modern copy-on-write (CoW) filesystem for Linux. It aims to implement many advanced filesystem features while focusing on fault tolerance, repair, and easy administration. The Btrfs filesystem is designed to support the requirement of high performance
Set default sound card in Pulse Audio
If you have more than one soundcard the default one that Ubuntu chooses is not always the one you want. Here is how to change that in the GUI or command-line. With the pavucontrol App Install pavucontrol (apt install pavucontrol)
How to Clone Hard Disks with ddrescue
When a hard drive starts to fail, you have a limited amount of time to take action, and many online tutorials recommend making a clone of the affected disk before it becomes completely unresponsive. At Datarecovery.com, we recommend contacting a
How To Set or Change Timezone in Ubuntu Linux
Using the correct timezone is essential for many systems related tasks and processes. For example, the CRON daemon uses the system’s timezone for executing CRON jobs, and the timestamps in the log files are based on the same system’s timezone.