How can you update your Ubuntu system?
Your question does not specify clearly that whether you want to simply update or patch installed Ubuntu distro packages or update major release of Ubuntu. Anyway let me give you solution with two possible scenarios:
1. How to update or upgrade or sometime also called patching Ubuntu packages:
a. Execute the below command
# apt-get update
Above command will updates the package lists for upgrades for packages that need upgrading, as well as new packages that have just come to the repositories.
b. Now once above command run successful execute below command to start upgrading the installed packages:
#apt-get upgrade
2. Second scenario how to upgrade Ubuntu major release:
Upgrading Ubuntu major release contain many steps which is not possible to explain here thus read my below blog in which I have written the procedure how to upgrade Ubuntu 18.04 LTS to Ubuntu 20.04 LTS in detail:
