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Finding out about package dependencies in Debian

apt-cache rdepends --installed modemmanager

modemmanager
Reverse Depends:
  libmm-glib0
  network-manager
  libmm-glib0
  network-manager
  geoclue-2.0

apt-cache depends --installed network-manager

network-manager
  Depends: libaudit1
  Depends: libbluetooth3
  Depends: libc6
  Depends: libcurl3-gnutls
  Depends: libglib2.0-0
  Depends: libgnutls30
  Depends: libjansson4
  Depends: libmm-glib0
  Depends: libndp0
  Depends: libnewt0.52
  Depends: libnm0
  Depends: libpsl5
  Depends: libreadline8
  Depends: libselinux1
  Depends: libsystemd0
    libelogind0
  Depends: libteamdctl0
  Depends: libudev1
  Depends: libuuid1
  Depends: wpasupplicant
  Depends: dbus
  Depends: udev
  Depends: adduser
  Depends: policykit-1
  Breaks: ppp
  Breaks: ppp
  Recommends: ppp
  Recommends: iptables
  Recommends: modemmanager
  Recommends: wireless-regdb
  Recommends: libpam-systemd
  Suggests: isc-dhcp-client

apt -a info modemmanager

Package: modemmanager
Version: 1.18.6-1~bpo11+1
Priority: optional
Section: net
Maintainer: DebianOnMobile Maintainers <debian-on-mobile-maintainers@dfgdfgdgdfg>
Installed-Size: 5,189 kB
Depends: libc6 (>= 2.14), libglib2.0-0 (>= 2.56.0), libgudev-1.0-0 (>= 232), libmbim-glib4 (>= 1.26.0), libmbim-proxy, libmm-glib0 (>= 1.18.2), libpolkit-gobject-1-0 (>= 0.99), libqmi-glib5 (>= 1.30.2), libqmi-proxy, libsystemd0 (>= 209), policykit-1
Recommends: usb-modeswitch
Homepage: https://www.freedesktop.org/wiki/Software/ModemManager/
Download-Size: 1,967 kB
APT-Sources: http://ftp.debian.org/debian bullseye-backports/main amd64 Packages
Description: D-Bus service for managing modems
 ModemManager is a DBus-activated daemon which controls mobile broadband
 (2G/3G/4G/5G) devices and connections. Whether built-in devices, USB dongles,
 Bluetooth-paired telephones or professional RS232/USB devices with external
 power supplies, ModemManager is able to prepare and configure the modems and
 setup connections with them.

Package: modemmanager
Version: 1.14.12-0.2
Priority: optional
Section: comm
Maintainer: Mathieu Trudel-Lapierre <mathieu.tl@dddfgdfgdg>
Installed-Size: 4,598 kB
Depends: libc6 (>= 2.14), libglib2.0-0 (>= 2.39.4), libgudev-1.0-0 (>= 212), libmbim-glib4 (>= 1.24.0~), libmbim-proxy, libmm-glib0 (>= 1.13.900), libpolkit-gobject-1-0 (>= 0.99), libqmi-glib5 (>= 1.26.0~), libqmi-proxy, libsystemd0 (>= 209), policykit-1
Recommends: usb-modeswitch
Homepage: https://www.freedesktop.org/wiki/Software/ModemManager/
Tag: hardware::modem, implemented-in::c, interface::daemon, role::program
Download-Size: 1,719 kB
APT-Manual-Installed: no
APT-Sources: http://ftp.fau.de/debian bullseye/main amd64 Packages
Description: D-Bus service for managing modems
 ModemManager is a DBus-activated daemon which controls mobile broadband
 (2G/3G/4G) devices and connections. Whether built-in devices, USB dongles,
 Bluetooth-paired telephones or professional RS232/USB devices with external
 power supplies, ModemManager is able to prepare and configure the modems and
 setup connections with them.

~~DISCUSSION~~