Prerequisites


Figure 941. .deb packages Slide presentation
  • Sample: firefox_75.0-2_amd64.deb

  • Archive containing:

    • Files

    • Pre- and post installation scripts

    • trigger


Figure 942. The dpkg command Slide presentation
  • Query installed, install / update from file system and purge packages, i.e.:

    > dpkg -i skypeforlinux-64.deb
    > dpkg -l apt*
    Desired=Unknown/Install/Remove/Purge/Hold
    | Status=Not/Inst/Conf-files/Unpacked/halF-conf/...
    +++-======================-=====================...
    ii  apt                    2.0.2                  amd64...
    ii  apt-config-icons       0.12.10-2              all 
    un  apt-config-icons-hidpi <none>                 <none>
    un  apt-doc                <none>                 <none> 
    un  apt-listbugs           <none>                 <none> ...
  • Low level package management

  • Dependency unaware


Figure 943. The apt command Slide presentation
  • Network based

  • Dependency aware

  • Automated system updates

#> apt update 
Hit:1 http://security.debian.org buster/updates InRelease
...
4 packages can be upgraded

#> apt upgrade 
... The following packages will be upgraded:
  libldap-2.4-2 libldap-common libssl1.1 openssl
...
Get:1 http://security.debian.org buster/updates/main ...
Get:2 http://security.debian.org buster/updates/main ...

Refreshing local package database.

Upgrading outdated packages.


Figure 944. Rationale using PPA's Slide presentation

Problems:

  • Not available here

  • Version outdated

  • Needing bleeding edge version