How to upgrade 18.04/19.04 to Ubuntu 19.10

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

ClientAliveInterval 60

Save and close the file. Then restart SSH daemon.

sudo systemctl restart ssh

To upgrade to Ubuntu 19.10, run the following command to upgrade existing software. (Please note that if a new kernel is installed while running the following command, you need to reboot system in order to continue the upgrade process.)

sudo apt update && sudo apt dist-upgrade

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

sudo apt install update-manager-core

Next, edit a configuration file using nano or your preferred command line text editor.

sudo nano /etc/update-manager/release-upgrades

At the bottom of this file, change the value of Prompt from lts to normal.

Prompt=normal

To save a file in Nano text editor, press Ctrl+O, then press Enter to confirm. To exit, press Ctrl+X.

Next, run the following command to begin the upgrade process.

do-release-upgrade

Sample output:

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] 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]

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

Calculating the changes

Calculating the changes
No candidate ver:  initscripts
No candidate ver:  insserv
No candidate ver:  libgdbm3
No candidate ver:  libjson-c2
No candidate ver:  libperl5.22
No candidate ver:  libpython3.5-minimal
No candidate ver:  linux-modules-4.15.0-20-generic
No candidate ver:  python3.5-minimal
No candidate ver:  sysv-rc

Do you want to start the upgrade? 


3 installed packages are no longer supported by Canonical. You can 
still get support from the community. 

55 new packages are going to be installed. 400 packages are going to 
be upgraded. 

You have to download a total of 308 M. This download will take about 
39 minutes with a 1Mbit DSL connection and about 11 hours with a 56k 
modem. 

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

 Continue [yN]  Details [d]y

If you are using Ubuntu 19.04, then follow the on-screen instruction to upgrade to Ubuntu 19.10.

If you are using Ubuntu 18.04, then follow the on-screen instruction to upgrade to Ubuntu 19.04 first. After that, follow the same steps to upgrade to Ubuntu 19.10.

Afterwards we must make sure that the GRUB2 bootloader is installed on hard drive /dev/sda:

grub-install /dev/sda

… and update our GRUB2 bootloader configuration:

update-grub
update-initramfs -u

Reboot your Ubuntu server.

reboot

To check your Ubuntu version, run:

lsb_release -a

Sample output:

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 19.10
Release:	19.10
Codename:	eoan

Should you use the -d option?
The update-manager and do-release-upgrade command come with a -d option, which will cause the system to upgrade to a development release.

Currently, Ubuntu 19.10 is still considered a development release in Ubuntu release cadence, because development of Ubuntu 20.04 isn’t started yet. It will happen one week after the release of Ubuntu 19.10 and we can use the -d option before that happens. When Ubuntu 20.04 enters development, you should not use the -d option.

Tested on these servers:
1. www.dedikuoti.lt – OpenVZ server error after attempt to upgrade “This version of the GNU libs requires kernel version 3.2 or later. No solution.
2. www.dedikuoti.lt – KVM server error after attempt to upgrade “grub2 – grub_file_filters not found after Ubuntu 19.10 upgrade”. Solution install or upgrade existing grub before reboot a server.
3. www.contabo.com – perfect no any errors.
4. www.digitalocean.com – perfect no any errors.
5. www.hostinger.lt – Ubuntu upgrade not possible.

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.

Conclusion
I hope this tutorial helped you upgrade Ubuntu 18.04 or Ubuntu 19.04 to Ubuntu 19.10.

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