Please check your repositories. I can't reproduce your issue on fresh Ubuntu MATE 20.04.3 LTS VM without any third-party repositories. I have successfully installed both PlayOnLinux and VirtualBox from Software Boutique.
``` $ cat /etc/os-release NAME="Ubuntu" VERSION="20.04.3 LTS (Focal Fossa)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.04.3 LTS" VERSION_ID="20.04" HOME_URL="https://www.ubuntu.com/"; SUPPORT_URL="https://help.ubuntu.com/"; BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"; PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"; VERSION_CODENAME=focal UBUNTU_CODENAME=focal $ sudo snap refresh All snaps up to date. $ snap list Name Version Rev Tracking Publisher Notes core18 20210722 2128 latest/stable canonical✓ base snapd 2.51.4 12883 latest/stable canonical✓ snapd software-boutique 0+git.f633ffb 54 latest/stable/… flexiondotorg classic ubuntu-mate-welcome 21.04.0-ef35c052 626 latest/stable/… flexiondotorg classic $ grep -r ^deb /etc/apt/ --include=*.list /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu/ focal main restricted /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu/ focal universe /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu/ focal-updates universe /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu/ focal multiverse /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu/ focal-updates multiverse /etc/apt/sources.list:deb http://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 $ sudo apt update -qq && apt list --upgradable All packages are up to date. Listing... Done $ dpkg -l | grep -vE "^ii|\|^Desired|" $ ``` Please prepare full info about your system and post topic about your problem on http://ubuntu-mate.community/ to get help. Current bug is fixed. Your last comment is not about a bug, so LP is a wrong place for rants like "Who is responsible...". Testers are always welcome, you can play your role nicely anytime. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1741607 Title: Software Boutique is broken on 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-mate-welcome/+bug/1741607/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
