Stumbled upon this problem when trying to install some packages which require build-essential to compile them (sidewinderd and ezthumb to be clear). I'm in the process of shifting my workstations to Ubuntu-based systems and this bug proves to be very annoying. Also sounds like it should actually be fixable pretty easy, just by publishing version 9.2 as 9.4 in focal and bumping the actual 9.3 simultaneously to 9.5 or something. But I'm by no means a dev, so I can't judge whether that would be appropriate... I tried to downgrade libc6, but apt's announcement to remove almost 270 packages doesn't look to healthy.... I don't want to try this just to reinstall or do some rescue-shenanignas to an otherwise (so far) fine running installation :( ~~~~~~~~ sudo apt install libc6=2.31-0ubuntu9.2 Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: libavahi-common-data:i386 libllvm10 libx11-xcb1:i386 Use 'sudo apt autoremove' to remove them. The following additional packages will be installed: i965-va-driver-shaders Suggested packages: glibc-doc The following packages will be REMOVED: adobeair devolo-dlan-cockpit devolo-ia32-libs:i386 glib-networking:i386 gstreamer1.0-plugins-base:i386 gstreamer1.0-plugins-good:i386 gstreamer1.0-x:i386 i965-va-driver i965-va-driver:i386 intel-media-va-driver:i386 lib32gcc-s1 lib32stdc++6 libaa1:i386 libaom0:i386 libapparmor1:i386 libasn1-8-heimdal:i386 libasound2:i386 libasound2-plugins:i386 libasyncns0:i386 libatk1.0-0:i386 libatomic1:i386 libavahi-client3:i386 libavahi-common3:i386 libavc1394-0:i386 libavcodec58:i386 libavutil56:i386 libblkid1:i386 libbrotli1:i386 libbsd0:i386 libbz2-1.0:i386 libc6:i386 libc6-dbg libc6-i386 libcaca0:i386 libcairo-gobject2:i386 libcairo2:i386 libcap2:i386 libcapi20-3:i386 libcdparanoia0:i386 libcodec2-0.9:i386 libcom-err2:i386 libcrypt1:i386 libcups2:i386 libcurl3-gnutls:i386 libdatrie1:i386 libdb5.3:i386 libdbus-1-3:i386 libdrm-amdgpu1:i386 libdrm-intel1:i386 libdrm-nouveau2:i386 libdrm-radeon1:i386 libdrm2:i386 libdv4:i386 libedit2:i386 libelf1:i386 libexif12:i386 libexpat1:i386 libfaudio0:i386 libffi7:i386 libflac8:i386 libfontconfig1:i386 libfreetype6:i386 libfribidi0:i386 libgail-common:i386 libgail18:i386 libgcc-s1:i386 libgcrypt20:i386 libgd3:i386 libgdbm-compat4:i386 libgdbm6:i386 libgdk-pixbuf2.0-0:i386 libgl1:i386 libgl1-mesa-dri:i386 libglapi-mesa:i386 libglib2.0-0:i386 libglu1-mesa:i386 libglvnd0:i386 libglx-mesa0:i386 libglx0:i386 libgmp10:i386 libgnutls30:i386 libgomp1:i386 libgpg-error0:i386 libgphoto2-6:i386 libgphoto2-port12:i386 libgpm2:i386 libgraphite2-3:i386 libgsm1:i386 libgssapi-krb5-2:i386 libgssapi3-heimdal:i386 libgstreamer-plugins-base1.0-0:i386 libgstreamer-plugins-good1.0-0:i386 libgstreamer1.0-0:i386 libgtk2.0-0:i386 libgudev-1.0-0:i386 libharfbuzz0b:i386 libhcrypto4-heimdal:i386 libheimbase1-heimdal:i386 libheimntlm0-heimdal:i386 libhogweed5:i386 libhx509-5-heimdal:i386 libice6:i386 libicu66:i386 libidn2-0:i386 libiec61883-0:i386 libieee1284-3:i386 libigdgmm11:i386 libjack-jackd2-0:i386 libjbig0:i386 libjpeg-turbo8:i386 libjpeg8:i386 libk5crypto3:i386 libkeyutils1:i386 libkrb5-26-heimdal:i386 libkrb5-3:i386 libkrb5support0:i386 liblcms2-2:i386 libldap-2.4-2:i386 libllvm10:i386 libllvm11:i386 libltdl7:i386 liblz4-1:i386 liblzma5:i386 libmount1:i386 libmp3lame0:i386 libmpg123-0:i386 libmysqlclient21:i386 libncurses6:i386 libncursesw6:i386 libnettle7:i386 libnghttp2-14:i386 libnspr4:i386 libnss3:i386 libnuma1:i386 libodbc1:i386 libogg0:i386 libopenal1:i386 libopenjp2-7:i386 libopus0:i386 liborc-0.4-0:i386 libosmesa6:i386 libp11-kit0:i386 libpango-1.0-0:i386 libpangocairo-1.0-0:i386 libpangoft2-1.0-0:i386 libpcap0.8:i386 libpci3:i386 libpciaccess0:i386 libpcre2-8-0:i386 libpcre3:i386 libperl5.30:i386 libpixman-1-0:i386 libpng16-16:i386 libproxy1v5:i386 libpsl5:i386 libpulse0:i386 libraw1394-11:i386 libroken18-heimdal:i386 librsvg2-2:i386 librsvg2-common:i386 librtmp1:i386 libsamplerate0:i386 libsane:i386 libsasl2-2:i386 libsasl2-modules:i386 libsasl2-modules-db:i386 libsdl2-2.0-0:i386 libselinux1:i386 libsensors5:i386 libshine3:i386 libshout3:i386 libslang2:i386 libsm6:i386 libsnappy1v5:i386 libsndfile1:i386 libsndio7.0:i386 libsnmp35:i386 libsoup2.4-1:i386 libsoxr0:i386 libspeex1:i386 libsqlite3-0:i386 libssh-4:i386 libssl1.1:i386 libstb0:i386 libstdc++6:i386 libswresample3:i386 libsystemd0:i386 libtag1v5:i386 libtag1v5-vanilla:i386 libtasn1-6:i386 libthai0:i386 libtheora0:i386 libtiff5:i386 libtinfo6:i386 libtwolame0:i386 libudev1:i386 libunistring2:i386 libusb-1.0-0:i386 libuuid1:i386 libv4l-0:i386 libv4lconvert0:i386 libva-drm2:i386 libva-x11-2:i386 libva2:i386 libvdpau1:i386 libvisual-0.4-0:i386 libvkd3d1:i386 libvorbis0a:i386 libvorbisenc2:i386 libvpx6:i386 libvulkan1:i386 libwavpack1:i386 libwayland-client0:i386 libwayland-cursor0:i386 libwayland-egl1:i386 libwebp6:i386 libwebpmux3:i386 libwind0-heimdal:i386 libwine:i386 libwrap0:i386 libx11-6:i386 libx264-155:i386 libx265-179:i386 libxau6:i386 libxaw7:i386 libxcb-dri2-0:i386 libxcb-dri3-0:i386 libxcb-glx0:i386 libxcb-present0:i386 libxcb-randr0:i386 libxcb-render0:i386 libxcb-shm0:i386 libxcb-sync1:i386 libxcb-xfixes0:i386 libxcb1:i386 libxcomposite1:i386 libxcursor1:i386 libxdamage1:i386 libxdmcp6:i386 libxext6:i386 libxfixes3:i386 libxi6:i386 libxinerama1:i386 libxkbcommon0:i386 libxml2:i386 libxmu6:i386 libxpm4:i386 libxrandr2:i386 libxrender1:i386 libxshmfence1:i386 libxslt1.1:i386 libxss1:i386 libxt6:i386 libxv1:i386 libxvidcore4:i386 libxxf86vm1:i386 libzstd1:i386 libzvbi0:i386 mesa-va-drivers:i386 mesa-vdpau-drivers:i386 mesa-vulkan-drivers:i386 ocl-icd-libopencl1:i386 va-driver-all va-driver-all:i386 vdpau-driver-all:i386 wine32:i386 zlib1g:i386 The following NEW packages will be installed: i965-va-driver-shaders The following packages will be DOWNGRADED: libc6 0 upgraded, 1 newly installed, 1 downgraded, 267 to remove and 0 not upgraded. Need to get 3.639 kB of archives. After this operation, 1.234 MB disk space will be freed. Do you want to continue? [Y/n] n Abort.