> For the complete documentation index, see [llms.txt](https://til.devjugal.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://til.devjugal.com/linux/system-upgrade.md).

# System Upgrade

**Ugrade all installed packages**

```bash
sudo apt-get update
sudo apt-get upgrade -y
```

**Reboot**

```bash
sudo reboot
```

**Remove unused packages and old kernel versions**

```bash
sudo apt --purge autoremove
```

**Install Ubuntu update tool**

```bash
sudo apt install update-manager-core
```

**Start Upgrade**

```bash
sudo do-release-upgrade
```

***Note:*** If it shows `There is no development version of an LTS available.`, run `sudo do-release-upgrade -d`

**System Restart**

```bash
sudo reboot
```

**Verify Distro**

```bash
lsb_release -a
```

**Enabled disabled 3rd party repo**

While upgrading distro 3rd party repositories can be disabled by Ubuntu for system stability, and these can be enabled again by looking into `/etc/apt/sources.list` file.

***Source:*** [***CyberCiti***](https://www.cyberciti.biz/faq/upgrade-ubuntu-18-04-to-20-04-lts-using-command-line/)