====== Ubuntu - apt-get - Update the package database ======

apt-get works on a database of available packages.

  * If this database is not updated, the system will not know if there are newer packages available or not.

----

<code bash>
sudo apt-get update
</code>

returns:

<code bash>
Hit:1 http://je.archive.ubuntu.com/ubuntu jammy InRelease
Get:2 http://je.archive.ubuntu.com/ubuntu jammy-updates InRelease [119 kB]
Get:3 http://je.archive.ubuntu.com/ubuntu jammy-backports InRelease [108 kB]
Get:4 http://je.archive.ubuntu.com/ubuntu jammy-updates/main amd64 DEP-11 Metadata [99.9 kB]
Get:5 http://je.archive.ubuntu.com/ubuntu jammy-updates/universe amd64 DEP-11 Metadata [274 kB]
Get:6 http://je.archive.ubuntu.com/ubuntu jammy-updates/multiverse amd64 DEP-11 Metadata [940 B]
Get:7 http://je.archive.ubuntu.com/ubuntu jammy-backports/main amd64 DEP-11 Metadata [8,000 B]
Get:8 http://je.archive.ubuntu.com/ubuntu jammy-backports/universe amd64 DEP-11 Metadata [16.8 kB]
Get:9 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]                                                                                                                                                                                                                                                                                                                  
Hit:10 https://ppa.launchpadcontent.net/kisak/kisak-mesa/ubuntu jammy InRelease                                                                                                                                                                                                                                                                                                            
Get:11 http://security.ubuntu.com/ubuntu jammy-security/main amd64 DEP-11 Metadata [41.5 kB]                                                                                                                                                                                                                                                                                               
Get:12 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 DEP-11 Metadata [21.9 kB]                                                                                                                                                                                                                                                                                           
Hit:13 https://repo.radeon.com/amdgpu/5.4.6/ubuntu jammy InRelease                                                                                                                                                                                                                                                                                                                         
Hit:14 https://repo.radeon.com/rocm/apt/5.4.6 jammy InRelease                                                                                                                                                                                                                                                                                                                              
Fetched 800 kB in 11s (75.7 kB/s)                                                                                                                                                                                                                                                                                                                                                          
Reading package lists... Done
</code>

<WRAP info>
**NOTE:**  Three types of lines are shown: Hit, Get, and Ign.

  * **Hit**:  There is no change in the package version.
  * **Ign**:  The package is being ignored.
    * There could be various reasons for that, including:
      * The package is so recent that it does not even bother to check for a new version.
      * There was an error in retrieving the file but error was trivial and thus it is being ignored. This is not an error. There is no need to be worried.
  * **Get**:  There is a new version of the package available.
    * apt-get will download this information (not the package itself).

</WRAP>