$ grep -r ^deb /etc/apt/ --include="*.list"

/etc/apt/sources.list.d/lutris-team-ubuntu-lutris-focal.list:deb http://ppa.launchpad.net/lutris-team/lutris/ubuntu focal main
/etc/apt/sources.list.d/team-xbmc-ubuntu-ppa-eoan.list:deb http://ppa.launchpad.net/team-xbmc/ppa/ubuntu focal main # disabled on upgrade to focal
/etc/apt/sources.list.d/gnome3-team-ubuntu-gnome3-focal.list:deb http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu focal main
/etc/apt/sources.list.d/slack.list:deb https://packagecloud.io/slacktechnologies/slack/debian/ jessie main
/etc/apt/sources.list.d/google-chrome.list:deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main
/etc/apt/sources.list:deb http://de.archive.ubuntu.com/ubuntu/ focal main restricted
/etc/apt/sources.list:deb http://de.archive.ubuntu.com/ubuntu/ focal-updates main restricted
/etc/apt/sources.list:deb http://de.archive.ubuntu.com/ubuntu/ focal universe
/etc/apt/sources.list:deb http://de.archive.ubuntu.com/ubuntu/ focal-updates universe
/etc/apt/sources.list:deb http://de.archive.ubuntu.com/ubuntu/ focal multiverse
/etc/apt/sources.list:deb http://de.archive.ubuntu.com/ubuntu/ focal-updates multiverse
/etc/apt/sources.list:deb http://de.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
/etc/apt/sources.list:deb http://security.ubuntu.com/ubuntu focal-security main restricted
/etc/apt/sources.list:deb http://security.ubuntu.com/ubuntu focal-security universe
/etc/apt/sources.list:deb http://security.ubuntu.com/ubuntu focal-security multiverse

---

$ dpkg --print-foreign-architectures

i386

---

$ apt-cache policy winehq-stable wine-stable wine32 libwine:i386

wine-stable:
  Installed: (none)
  Candidate: 3.0.1ubuntu1
  Version table:
     3.0.1ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        500 http://de.archive.ubuntu.com/ubuntu focal/universe i386 Packages
wine32:i386:
  Installed: (none)
  Candidate: 5.0-3ubuntu1
  Version table:
     5.0-3ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu focal/universe i386 Packages
libwine:i386:
  Installed: (none)
  Candidate: 5.0-3ubuntu1
  Version table:
     5.0-3ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu focal/universe i386 Packages
N: Unable to locate package winehq-stable

### ^ this is because I have previously removed the repository

---

$ dpkg -l | grep -i wine

ii  fonts-wine                                                  5.0-3ubuntu1                                                all          Windows API implementation - fonts
ii  libkwineffects12                                            4:5.18.5-0ubuntu0.1                                         amd64        KDE window manager effects library
ii  libwine:amd64                                               5.0-3ubuntu1                                                amd64        Windows API implementation - library
ii  wine                                                        5.0-3ubuntu1                                                all          Windows API implementation - standard suite
ii  wine64                                                      5.0-3ubuntu1                                                amd64        Windows API implementation - 64-bit binary loader
ii  winetricks                                                  0.0+20200412-1                                              all          simple tool to work around common problems in Wine

### ^ for some reason I cannot see here wine32 which seams to be required as it is stated in the next section

---

$ wine

it looks like wine32 is missing, you should install it.
as root, please execute "apt-get install wine32"
Usage: wine PROGRAM [ARGUMENTS...]   Run the specified program
       wine --help                   Display this help and exit
       wine --version                Output version information and exit