Comment 2 for bug 1762630

You might use the genuine sources.
Here are mine; what are yours ?

when i see your output, i wonder how you have installed ubuntu bionic (as essential packages are requested for installation: apt, debconf, dpkg; they are always installed on normal system)
**********
The following additional packages will be installed:
  adduser apt apt-utils bzip2 ca-certificates debconf debconf-i18n dpkg
*********

oem@ubuntu:~$ cat /etc/apt/sources.list

deb http://archive.ubuntu.com/ubuntu/ bionic main restricted
deb http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted

deb http://archive.ubuntu.com/ubuntu/ bionic universe
deb http://archive.ubuntu.com/ubuntu/ bionic-updates universe

deb http://archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://archive.ubuntu.com/ubuntu/ bionic-updates multiverse

# deb http://archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse

deb http://archive.canonical.com/ubuntu bionic partner

deb http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse
deb http://archive.ubuntu.com/ubuntu/ bionic-proposed universe restricted multiverse main