El subproceso /usr/bin/dpkg devolvió un código de error (100) error dpkg

El subproceso /usr/bin/dpkg devolvió un código de error (100) error dpkg

Estoy usando Ubuntu 18.04.5 LTS. Tenía dpkg bloqueado al intentar instalar un nuevo paquete. luego elimino el error dpkg bloqueado y encontrado llamado dpkg no encontrado. Intenté "sudo apt install dpkg" pero dice que ya instalé el nuevo dpkg.

salida de sudo apt install dpkg:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
dpkg is already the newest version (1.19.0.5ubuntu2.3).
0 upgraded, 0 newly installed, 0 to remove and 37 not upgraded.

después de eso probé " sudo apt-get install --reinstall dpkg" y encontré el resultado

Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 37 not upgraded.
Need to get 1,136 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 dpkg amd64 1.19.0.5ubuntu2.3 [1,136 kB]
Fetched 1,136 kB in 1s (1,450 kB/s)                  
Could not exec dpkg!
/usr/lib/libdvd-pkg/b-i_libdvdcss.sh: 7: /usr/lib/libdvd-pkg/b-i_libdvdcss.sh: dpkg: not found
E: Sub-process /usr/bin/dpkg returned an error code (100)

entonces no puedo instalar dpkg y tampoco puedo eliminar este error.

Nota: sudo apt upgradeno funciona en absoluto.salida

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
  distro-info python3-click python3-colorama
The following packages will be upgraded:
  apt apt-utils docker.io gnome-shell gnome-shell-common grub-common grub-efi-amd64-bin grub-efi-amd64-signed grub-pc grub-pc-bin grub2-common
  initramfs-tools initramfs-tools-bin initramfs-tools-core isc-dhcp-client isc-dhcp-common libapt-inst2.0 libapt-pkg5.0 libnss-myhostname
  libnss-systemd libpam-systemd libseccomp2 libsystemd0 libudev1 linux-firmware python3-distupgrade sbsigntool systemd systemd-sysv
  ubuntu-advantage-tools ubuntu-drivers-common ubuntu-keyring ubuntu-release-upgrader-core ubuntu-release-upgrader-gtk udev update-notifier
  update-notifier-common
37 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/126 MB of archives.
After this operation, 2,394 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Extracting templates from packages: 100%
Preconfiguring packages ...
/tmp/ubuntu-advantage-tools.config.idFIRB: 7: /tmp/ubuntu-advantage-tools.config.idFIRB: dpkg: not found
/tmp/grub-pc.config.YIkgdy: 1: /tmp/grub-pc.config.YIkgdy: dpkg: not found
Could not exec dpkg!
/usr/lib/libdvd-pkg/b-i_libdvdcss.sh: 7: /usr/lib/libdvd-pkg/b-i_libdvdcss.sh: dpkg: not found
E: Sub-process /usr/bin/dpkg returned an error code (100)

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