Ubuntu Server 20.04 LTS walkthrough »
  -  
« Run your CI test with GitLab-Runner on your system
Apr
26
2020
Upgrading from Ubuntu 18.04 LTS to Ubuntu 20.04 LTS
Posted by ebal at 12:47:34 in blog, planet_ellak, planet_Sysadmin, planet_fsfe

Server Edition

disclaimer: at this moment there is not an “official” server version of an 20.04 LTS available, so we we will use the development 20.04 release.

Maintenance

If this is a production server, do not forget to inform customers/users/clients that this machine is under maintenance before you start.

backup

When was the last time you took a backup?
Now is a good time.
Try to verify your backup otherwise do not proceed.

Update you current system

Before continue with the dist upgrade to 20.04 LTS, we need to update & upgrade our current LTS version.

Login to your system:

~> ssh ubuntu1804

apt update
apt -y upgrade

reboot is necessary.

update

root@ubuntu:~# apt update
Hit:1 http://gr.archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://gr.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:3 http://gr.archive.ubuntu.com/ubuntu bionic-backports InRelease
Hit:4 http://gr.archive.ubuntu.com/ubuntu bionic-security InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
51 packages can be upgraded. Run 'apt list --upgradable' to see them.

upgrade

# apt -y upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
  bsdutils distro-info-data dmidecode fdisk grub-common grub-pc grub-pc-bin grub2-common landscape-common libblkid1 libfdisk1 libmount1 libnss-systemd
  libpam-systemd libsmartcols1 libsystemd0 libudev1 libuuid1 linux-firmware mount open-vm-tools python3-update-manager sosreport systemd systemd-sysv udev
  unattended-upgrades update-manager-core util-linux uuid-runtime
51 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 85.6 MB of archives.
After this operation, 751 kB of additional disk space will be used.
Get:1 http://gr.archive.ubuntu.com/ubuntu bionic-updates/main amd64 bsdutils amd64 1:2.31.1-0.4ubuntu3.6 [60.3 kB]
...

reboot

# reboot

Do release upgrade

root@ubuntu:~# which do-release-upgrade
/usr/bin/do-release-upgrade

help

do-release-upgrade --help
root@ubuntu:~# do-release-upgrade --help
Usage: do-release-upgrade [options]

Options:
  -h, --help            show this help message and exit
  -V, --version         Show version and exit
  -d, --devel-release   If using the latest supported release, upgrade to the
                        development release
  --data-dir=DATA_DIR   Directory that contains the data files
  -p, --proposed        Try upgrading to the latest release using the upgrader
                        from $distro-proposed
  -m MODE, --mode=MODE  Run in a special upgrade mode. Currently 'desktop' for
                        regular upgrades of a desktop system and 'server' for
                        server systems are supported.
  -f FRONTEND, --frontend=FRONTEND
                        Run the specified frontend
  -c, --check-dist-upgrade-only
                        Check only if a new distribution release is available
                        and report the result via the exit code
  --allow-third-party   Try the upgrade with third party mirrors and
                        repositories enabled instead of commenting them out.
  -q, --quiet

do-release-upgrade

# do-release-upgrade -m server
root@ubuntu:~# do-release-upgrade -m server
Checking for a new Ubuntu release
There is no development version of an LTS available.
To upgrade to the latest non-LTS develoment release
set Prompt=normal in /etc/update-manager/release-upgrades.

server

do-release-upgrade -m server -d
root@ubuntu:~# do-release-upgrade -m server -d
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1,554 B]

Get:2 Upgrade tool [1,344 kB]

Fetched 1,346 kB in 0s (0 B/s)

authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg'
extracting 'focal.tar.gz'

at this moment, we will switch to a gnu/screen session

Reading cache

Checking package manager

Continue running under SSH?

This session appears to be running under ssh. It is not recommended
to perform a upgrade over ssh currently because in case of failure it
is harder to recover.

If you continue, an additional ssh daemon will be started at port
'1022'.
Do you want to continue?

Continue [yN]

Press: y

Starting additional sshd

To make recovery in case of failure easier, an additional sshd will
be started on port '1022'. If anything goes wrong with the running
ssh you can still connect to the additional one.
If you run a firewall, you may need to temporarily open this port. As
this is potentially dangerous it's not done automatically. You can
open the port with e.g.:
'iptables -I INPUT -p tcp --dport 1022 -j ACCEPT'

To continue please press [ENTER]

Press Enter

update repos

Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://gr.archive.ubuntu.com/ubuntu bionic InRelease
Get:1 http://gr.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]

Get:2 http://gr.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]

Get:3 http://gr.archive.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:4 http://gr.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [916 kB]
Fetched 1,168 kB in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done

Updating repository information
Get:1 http://gr.archive.ubuntu.com/ubuntu focal InRelease [265 kB]
...

…

...
Get:32 http://gr.archive.ubuntu.com/ubuntu focal-security/multiverse amd64 c-n-f Metadata [116 B]
Fetched 57.3 MB in 6s (1,247 kB/s)

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done

Calculating the changes

Calculating the changes

Do you want to start the upgrade?

3 packages are going to be removed. 105 new packages are going to be
installed. 428 packages are going to be upgraded.

You have to download a total of 306 M. This download will take about
3 minutes with your connection.

Installing the upgrade can take several hours. Once the download has
finished, the process cannot be canceled.

 Continue [yN]  Details [d]

Press y

(or review by pressing d )

Fetching packages

Fetching

...
Get:3 http://gr.archive.ubuntu.com/ubuntu focal/main amd64 libcrypt1 amd64 1:4.4.10-10ubuntu4 [78.2 kB]
Get:4 http://gr.archive.ubuntu.com/ubuntu focal/main amd64 libc6 amd64 2.31-0ubuntu9 [2,713 kB]
...

services

at some point a question will pop:

  • Restart services during package upgrade without asking ?

I answered Yes but you should answer this the way you prefer.

f782394f.png

patience is a virtue

Get a coffee or tea. Read a magazine.

Patience is a virtue

till you see a jumping animal.

resolved

Configuration file '/etc/systemd/resolved.conf'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** resolved.conf (Y/I/N/O/D/Z) [default=N] ?

I answered this Y, I will change it later.

vim

same here

Configuration file '/etc/vim/vimrc'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** vimrc (Y/I/N/O/D/Z) [default=N] ? Y

ssh conf

b302c319.png

Remove obsolete packages

and finally

Progress: [ 99%]
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
Processing triggers for initramfs-tools (0.136ubuntu6) ...
update-initramfs: Generating /boot/initrd.img-5.4.0-26-generic
Processing triggers for dbus (1.12.16-2ubuntu2) ...
Reading package lists... Done
Building dependency tree
Reading state information... Done

Searching for obsolete software
Reading state information... Done

Remove obsolete packages?

59 packages are going to be removed.

 Continue [yN]  Details [d]

Press y to continue

Restart

are you ready to restart your machine ?

System upgrade is complete.

Restart required

To finish the upgrade, a restart is required.
If you select 'y' the system will be restarted.

Continue [yN]

Press y to restart

LTS 20.04

Welcome to Ubuntu 20.04 LTS (GNU/Linux 5.4.0-26-generic x86_64)

  System information as of Sun 26 Apr 2020 10:34:43 AM UTC

  System load:  0.52               Processes:               135
  Usage of /:   24.9% of 19.56GB   Users logged in:         0
  Memory usage: 3%                 IPv4 address for enp1s0: 192.168.122.77
  Swap usage:   0%

 * Ubuntu 20.04 LTS is out, raising the bar on performance, security,
   and optimisation for Intel, AMD, Nvidia, ARM64 and Z15 as well as
   AWS, Azure and Google Cloud.

     https://ubuntu.com/blog/ubuntu-20-04-lts-arrives

0 updates can be installed immediately.
0 of these updates are security updates.

Last login: Sun Apr 26 07:50:39 2020 from 192.168.122.1

$ cat /etc/os-release

NAME="Ubuntu"
VERSION="20.04 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
Tag(s): ubuntu, 18.04, 20.04, LTS
Ubuntu Server 20.04 LTS walkthrough »
  -  
« Run your CI test with GitLab-Runner on your system