Why you need to know your Linux version

Your Linux version tells you which security updates are available, whether software you want to install will run on your system, and how much longer your operating system will receive fixes. Different versions stop receiving updates at different times — some after two years, others after five or ten. Checking your version takes less than a minute and gives you real information about what you're working with.

The version number itself is split into parts that mean different things. A number like 22.04 or 20.04 tells you the release year and month, while a name like "Jammy" or "Focal" is just a label. Understanding what you're looking at prevents confusion when you search for updates or troubleshoot problems.

Key Takeaways

  • The lsb_release -a command shows your version name, number, and release date in one readable output.
  • The uname -r command shows only the kernel version, which is different from your operating system version but equally important for compatibility.
  • Version numbers like 22.04 indicate the year and month of release, and you can find the end-of-life date by searching your distribution's support schedule.
  • Long-term support (LTS) versions receive updates for five years or more, while standard versions stop receiving updates after nine months.

The quickest way: lsb_release command

Open a terminal window and type lsb_release -a, then press Enter. This command displays your Linux distribution name, version number, release name, and the date it was released. On Ubuntu, you might see output like "Ubuntu 22.04.1 LTS (Jammy Jellyfish)" — the 22.04 means April 2022, and LTS means it will receive updates until April 2027.

If the command does not work, your system may not have the lsb-release package installed. In that case, move to the next method instead of trying to install it — the other approaches work on every Linux system.

Checking the kernel version separately

Your kernel version is different from your operating system version, and you may need both. Type uname -r to see only the kernel. The output looks like "5.15.0-56-generic" — the first number (5) is the major version, the second (15) is the minor version, and the rest identifies the specific build.

You need the kernel version when you are installing drivers, compiling software, or troubleshooting hardware problems. Your operating system version matters for package updates and support timelines. They are not the same thing, and some software requires a specific kernel version even if your operating system is current.

Reading the /etc/os-release file directly

Every Linux system stores version information in a text file called /etc/os-release. Type cat /etc/os-release to read it. The output shows lines like "NAME=Ubuntu", "VERSION=22.04 LTS", and "VERSION_CODENAME=jammy". This file works on every modern Linux distribution, even ones that do not have the lsb-release package.

The information here is the same as what lsb_release shows, just in a different format. If you are writing a script or checking version information on many machines, this file is more reliable because it exists everywhere.

Understanding version numbers and support timelines

Ubuntu version numbers follow a pattern: the first two digits are the year, the next two are the month. Version 22.04 was released in April 2022. Version 20.04 was released in April 2020. Other distributions use different numbering systems — Fedora uses sequential numbers (38, 39, 40), while Debian uses code names (Bullseye, Bookworm) — but the principle is the same: the number tells you when it was released.

The support timeline depends on whether you have a standard release or a long-term support (LTS) version. Standard releases receive updates for nine months. LTS releases receive updates for five years on Ubuntu, ten years on Debian. You can find your distribution's exact end-of-life date by searching "[your distribution name] [your version number] end of life" — this matters because once support ends, security fixes stop arriving.

What to do after you know your version

Once you have your version number, check whether it is still receiving updates. Search for your distribution's release schedule — Ubuntu publishes theirs at ubuntu.com/about/release-cycle, Fedora at fedoraproject.org/wiki/Releases. If your version is near or past its end-of-life date, plan an upgrade to a newer version that still receives support.

If you are installing software and it says it requires a specific version, now you know whether your system meets that requirement. If you are troubleshooting a problem and someone online asks what version you are running, you can answer with the exact number instead of guessing. Version information is not just a label — it determines what updates you get and how long your system stays find.

Frequently Asked Questions

What is the difference between the operating system version and the kernel version?

The operating system version (like Ubuntu 22.04) is the distribution you installed. The kernel version (like 5.15.0) is the core of the system that manages hardware and processes. You can update the kernel without changing your operating system version, and some software requires a specific kernel even if your operating system is current.

Does my version number tell me if I have 32-bit or 64-bit Linux?

No, the version number does not show this. Type uname -m instead — if it shows "x86_64" you have 64-bit, if it shows "i686" you have 32-bit. Most modern systems are 64-bit, but some older machines or specialized systems run 32-bit.

What should I do if my version is no longer receiving updates?

Plan an upgrade to a newer version that still receives support. The exact steps depend on your distribution — Ubuntu has an upgrade tool you can run from the terminal, while other distributions may require a fresh install. Check your distribution's documentation for the safest upgrade path.

Can I have multiple Linux versions installed on one computer?

Yes, you can use a tool like GRUB (the boot menu) to choose which version starts when you turn on the computer. This is called dual-booting or multi-booting. Each version is independent, so checking the version in one does not tell you what is installed in the other.

Why do some people call it "Ubuntu 22.04 LTS" and others just "22.04"?

They mean the same thing. The full name includes the distribution (Ubuntu), the version number (22.04), and the support type (LTS for long-term support). People shorten it depending on context — if you are already talking about Ubuntu, saying just "22.04" is clear enough.