apt

Table of Contents

1. Remove packages configuration files leftovers ~c

Quote from notes:aptitude README.

?config-files, ~c

Matches packages which have been removed, but whose configuration files remain on the system (ie, they were removed but not purged).

See notes:aptitude#search-terms for the search term reference. 

apt list '~c'
apt purge '~c'

2. Remove obsolete packages ~o

Quote from notes:aptitude README.

?obsolete, ~o

This term matches any installed package which is not available in any version from any archive. These packages appear as “Obsolete or Locally Installed” in the visual interface.

See notes:aptitude#search-terms for the search term reference. 

apt list '~o'
apt purge '~o'

3. List installed packages ~i

See notes:aptitude#search-terms for the search term reference. 

apt list '~i'
apt list [-i,--installed]

4. List upgradable packages ~U

See notes:aptitude#search-terms for the search term reference. 

apt list '~U'
apt [-qq] list [-u,--upgradeable]

5. List packages filtered by Origin

See notes:apt-cache to find Origin.

5.1. List installed packages whose Origin is Raspberry Pi Foundation

apt list '?origin(Raspberry Pi Foundation) ?installed'

5.2. List installed packages whose Origin is not Debian

Long and short form of the same command, see notes:aptitude#search-terms. 

apt list '?narrow(?installed, ?not(?origin(Debian)))'
apt list '~S ~i !~ODebian'

6. Install package from Debian stable

apt install linux-image-amd64/stable

7. Install package from Debian backports

See notes:debian#backports 

apt install linux-image-amd64/trixie-backports

8. Configure periodic updates

See the apt.systemd.daily file for documentation.

Create this file /etc/apt/apt.conf.d/10periodic to update the package lists every 2 days. 

# See /usr/lib/apt/apt.systemd.daily for documentation.
APT::Periodic::Enable "1";
APT::Periodic::Update-Package-Lists "2";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::Unattended-Upgrade "0";
  • APT::Periodic::Enable "1"; Enable the update/upgrade script (0 to disable).
  • APT::Periodic::Update-Package-Lists "2"; Do “apt-get update” every N days (0 to disable).
  • APT::Periodic::Download-Upgradeable-Packages "0"; Do “apt-get upgrade –download-only” every N days (0 to disable).
  • APT::Periodic::Unattended-Upgrade "0"; Upgrade packages with the unattended-upgrade script every N days (0 to disable), see notes:unattended-upgrades.

You can check the current configuration with apt-config (see notes:apt-config). 

apt-config dump "APT::PERIODIC"

See notes:unattended-upgrades for installing updates automatically.

9. Related nodes

10. References

lun. 28 sept. 2026

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