Prerequisites


Figure 967. .deb packages Slide presentation

  • Sample: firefox_75.0-2_amd64.deb

  • Archive containing:

    • Files

    • Pre- and post installation scripts

    • trigger


Figure 968. 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 969. The apt command Slide presentation

  • Network based

  • Dependency aware

  • Automated system updates

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

#> apt upgrade ❷
... 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 ...

❶

Refreshing local package database.

❷

Upgrading outdated packages.

Figure 970. Rationale using PPA's Slide presentation

Problems:

  • “Not available here”

  • Version outdated

  • Needing “bleeding edge” version


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