hot to upgrade lubuntu

Asked by john axinos on 2018-07-02

hot to upgrade lubuntu 15 to Lububtu 18
I burnt Lububtu 18 iso file in CD but when I boot from CD Lubuntu 18 system ask me to format again my system and
install Lubuntu from zero.
Can I upgrade lubuntu 15 from CD Lububtu 18 wihout formatting my system by Boot CD?
Can I upgrade lubuntu 15 from CD Lububtu 18 on line wihout CD?

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john axinos
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What is the output of:

lsb_release -a; uname -a


Launchpad Janitor (janitor) said : #2

This question was expired because it remained in the 'Needs information' state without activity for the last 15 days.

john axinos (axinos55) said : #3

john@athlon64:~$ lsb_release -a; uname -a;
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.10
Release: 15.10
Codename: wily
Linux athlon64 4.2.0-34-generic #39-Ubuntu SMP Thu Mar 10 22:13:01 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
john@athlon64:~$ ^C

OK looks good. If you run:

sudo do-release-upgrade

Does it upgrade to 16.04 ok?

You need to upgrade to 16.04 first and then to 18.04 from that (LTS to LTS upgrades are supported) you cannot leapfrog versions so you cannot go from 15.10 to 18.04 without wiping the current installation off and doing a clean install of Bionic from USB / CD

john axinos (axinos55) said : #6

thank you very much for your help
I upgrated to 16.04LTS online, it takes about 1 hour, and then I upgrated to 18.04LTS online, it takes about 2 hours
now the system is working with 18.04LTS with libreoffice

john axinos (axinos55) said : #7

from terminal:
sudo do-release-upgrade
and I had an error “the required dependency 'apt (>=' is not installed”
I downloaded the file:
and run it
Then I run
sudo apt-get update
sudo do-release-upgrade
and I installed 16.04
After reboot I run again
sudo do-release-upgrade
and I installed 18.04
thank you for your help