Your bug report indicates that you install your system using 20.04.1 LTS. Yet, it shows that you are upgrading from 1:3.3.6-30 to 1:3.3.6-30ubuntu2 however, 1:3.3.6-30 was never available in 20.04....
Are you mixing bionic (18.04) & focal (20.04) by accident? Again, one needs not to manually download any packages. Co-installing i386 & amd64 packages is supported securely by apt out of the box. If i386 architecutre is not enabled, you can enable it with: $ sudo dpkg --add-architecture i386 $ sudo apt update And then install many :i386 packages that we provide specifically to support 32-bit 3rd party software. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1892281 Title: package libstdc++5 (not installed) failed to install/upgrade: trying to overwrite shared '/usr/share/doc/libstdc++5/changelog.Debian.gz', which is different from other instances of package libstdc++5:i386 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-3.3/+bug/1892281/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
