Upgrade Ubuntu 16.04/17.10 to Ubuntu 18.04 From Command Line

You can use command line to upgrade Ubuntu desktop or a headless server. Speaking of servers, it is recommended that you upgrade Ubuntu on a test server before doing it on a production server.

If you use SSH to log into your Ubuntu server, it’s a good idea to keep your OpenSSH session alive by adding the following line in /etc/ssh/sshd_config file on your server.

nano /etc/ssh/sshd_config
ClientAliveInterval 60

Save and close the file. Then restart SSH daemon.

systemctl restart ssh

To upgrade to Ubuntu 18.04, first run the following command to upgrade existing software.

apt update && apt dist-upgrade

Then make sure you have update-manager-core package installed.

 apt install update-manager-core

After that, run the following command to begin the upgrade process.

do-release-upgrade

Then follow the on-screen instruction to upgrade to Ubuntu 18.04. Once the upgrade is finished, reboot your Ubuntu desktop or server. To check your Ubuntu version, run:

lsb_release -a

Output:

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04 LTS
Release:	18.04
Codename:	bionic

You also need to re-enable third-party repositories such as PPA because they are disabled during upgrade.

Attention: this update will not work on dedikuoti.lt OpenVZ servers except KVM servers.

OpenVZ container will return this message:

This version of the GNU libc requires kernel version 3.2 or later. Please upgrade your kernel before installing glibc.

 

How To Install Apache Tomcat 9 on Ubuntu 16.04

Apache Tomcat is a web server and servlet container that is used to serve Java applications. Tomcat is an open source implementation of the Java Servlet and JavaServer Pages technologies, released by the Apache Software Foundation. This tutorial covers the basic installation and some configuration of the latest release of Tomcat 9 on your Ubuntu 16.04 server.

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How to solve the “changed its ‘Origin’ value from ‘Google, Inc.’ to ‘Google LLC'” APT error

If you are on Debian or Ubuntu and using Google official repositories for Google Chrome Remote Desktop, you might have received the following error while updating your system.

E: Repository 'http://dl.google.com/linux/chrome/deb stable Release' changed its 'Origin' value from 'Google, Inc.' to 'Google LLC'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.

Just run

sudo apt update

And you will be prompted to accept the new Origin of the repository

Do you want to accept these changes and continue updating from this repository? [y/N] 

And that’s it.

Turn off beep / bell on linux terminal

Working with the terminal using a command interface is very fast and effective way of doing stuff. But have you tried working with the terminal, listening to a music via headphones and having a terminal warning or tab-completion beep / bell turned ON at the same time? Well it can be very annoying. Listening to the PC Speaker beeps via headphones is very close to a feeling of hitting your head with a hammer. Even without headphones this beeping bell sound is very annoying.

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How to set up software RAID1 on a running LVM system (incl. GRUB2 configuration) (Ubuntu 18.04)

This guide explains how to set up software RAID1 on an already running LVM system (Ubuntu 18.04). The GRUB2 bootloader will be configured in such a way that the system will still be able to boot if one of the hard drives fails (no matter which one).

I do not issue any guarantee that this will work for you!

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