[SOLVED] Openfoam dependencies not installed

[tie_mann]

LM 20.2 "Uma". See below text for inxi output.

When following the Ubuntu-based installation instructions for Openfoam9, I'm told by apt:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
openfoam9 : Depends: g++ but it is not going to be installed
Depends: libreadline-dev but it is not going to be installed
Depends: libopenmpi-dev but it is not going to be installed
Depends: libcgal-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Looking at versions of these dependencies via apt list, and following the dependencies apt lists for them, I find libc6-dev is commonly required but won't be installed. "ldd --version" returns

ldd (Ubuntu GLIBC 2.31-0ubuntu9.3) 2.31
Copyright (C) 2020 Free Software Foundation, Inc.

"apt-cache policy libc6-dev" outputs the following:

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libc6-dev:
  Installed: (none)
  Candidate: 2.31-0ubuntu9.2
  Version table:
     2.31-0ubuntu9.2 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
     2.31-0ubuntu9 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

. So it seems I not only don't have libc6-dev installed, but the repos no longer have it! Is openfoam9 wanting to install a much older version of a C library that would break things relying on glibc 2.31? I thought the naming convention of shared objects was supposed to allow different versions of libraries to use, or is that up to developers to make use of?

Basically, I'm looking to get Openfoam9 installed locally, without using containers; though, if it ends up being easier/quicker to go that route, I will.

Alternatively, let me know if I'm completely misunderstanding the problem; any correction is appreciated.

inxi:

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System:    Kernel: 5.4.0-91-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Cinnamon 5.0.7 
           wm: muffin 5.0.2 dm: LightDM 1.30.0 Distro: Linux Mint 20.2 Uma base: Ubuntu 20.04 focal 
Machine:   Type: Desktop Mobo: Gigabyte model: B550 AORUS PRO AC v: x.x serial: <filter> BIOS: American Megatrends 
           v: F10 date: 09/18/2020 
CPU:       Topology: 6-Core model: AMD Ryzen 5 5600X bits: 64 type: MT MCP arch: Zen 3 L2 cache: 3072 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 88641 
           Speed: 2195 MHz min/max: 2200/3700 MHz boost: enabled Core speeds (MHz): 1: 2196 2: 2193 3: 2195 
           4: 2195 5: 2191 6: 2192 7: 2195 8: 2195 9: 2194 10: 2193 11: 2195 12: 2195 
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] Tahiti PRO [Radeon HD 7950/8950 OEM / R9 280] 
           vendor: ASUSTeK driver: radeon v: kernel bus ID: 09:00.0 chip ID: 1002:679a 
           Display: x11 server: X.Org 1.20.11 driver: ati,radeon unloaded: fbdev,modesetting,vesa 
           resolution: 1920x1080~60Hz 
           OpenGL: renderer: AMD TAHITI (DRM 2.50.0 5.4.0-91-generic LLVM 12.0.0) v: 4.5 Mesa 21.0.3 
           direct render: Yes 
Audio:     Device-1: Advanced Micro Devices [AMD/ATI] Tahiti HDMI Audio [Radeon HD 7870 XT / 7950/7970] 
           vendor: ASUSTeK driver: snd_hda_intel v: kernel bus ID: 09:00.1 chip ID: 1002:aaa0 
           Device-2: Advanced Micro Devices [AMD] Starship/Matisse HD Audio vendor: Gigabyte driver: snd_hda_intel 
           v: kernel bus ID: 0b:00.4 chip ID: 1022:1487 
           Sound Server: ALSA v: k5.4.0-91-generic 
Network:   Device-1: Realtek RTL8125 2.5GbE vendor: Gigabyte driver: r8125 v: 9.006.04-NAPI port: f000 
           bus ID: 07:00.0 chip ID: 10ec:8125 
           IF: eno1 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: Intel Wireless-AC 9260 driver: iwlwifi v: kernel port: f000 bus ID: 08:00.0 
           chip ID: 8086:2526 
           IF: wlp8s0 state: down mac: <filter> 
Drives:    Local Storage: total: 931.48 GiB used: 396.63 GiB (42.6%) 
           ID-1: /dev/sda vendor: Samsung model: SSD 860 EVO 500GB size: 465.76 GiB speed: 6.0 Gb/s 
           serial: <filter> rev: 4B6Q scheme: MBR 
           ID-2: /dev/sdb vendor: Seagate model: ST3250318AS size: 232.83 GiB speed: 3.0 Gb/s rotation: 7200 rpm 
           serial: <filter> rev: CC46 scheme: MBR 
           ID-3: /dev/sdc vendor: Western Digital model: WD2500JS-00MHB0 size: 232.89 GiB speed: 3.0 Gb/s 
           serial: <filter> rev: 1C03 scheme: MBR 
Partition: ID-1: / size: 456.46 GiB used: 91.51 GiB (20.0%) fs: ext4 dev: /dev/sda5 
Sensors:   System Temperatures: cpu: 0.0 C mobo: N/A gpu: radeon temp: 38 C 
           Fan Speeds (RPM): N/A 
Repos:     No active apt repos in: /etc/apt/sources.list 
           No active apt repos in: /etc/apt/sources.list.d/additional-repositories.list 
           Active apt repos in: /etc/apt/sources.list.d/atom.list 
           1: deb [arch=amd64] https://packagecloud.io/AtomEditor/atom/any/ any main
           Active apt repos in: /etc/apt/sources.list.d/google-chrome.list 
           1: deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main
           Active apt repos in: /etc/apt/sources.list.d/kicad-kicad-5_1-releases-focal.list 
           1: deb http://ppa.launchpad.net/kicad/kicad-5.1-releases/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/kicad-kicad-dev-nightly-focal.list 
           1: deb http://ppa.launchpad.net/kicad/kicad-dev-nightly/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/nodesource.list 
           1: deb [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_16.x focal main
           2: deb-src [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_16.x focal main
           Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
           1: deb http://packages.linuxmint.com uma main upstream import backport #id:linuxmint_main
           2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
           3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
           4: deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
           5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
           6: deb http://archive.canonical.com/ubuntu/ focal partner
           Active apt repos in: /etc/apt/sources.list.d/openfoam.list 
           1: deb http://dl.openfoam.org/ubuntu focal main
Info:      Processes: 287 Uptime: 3h 23m Memory: 31.35 GiB used: 1.82 GiB (5.8%) Init: systemd v: 245 runlevel: 5 
           Compilers: gcc: 9.3.0 alt: 9 Shell: bash v: 5.0.17 running in: gnome-terminal inxi: 3.0.38

[spamegg]

Hello tie_mann

That 9.3/9.2 version problem is due to a bug in the repositories that happened a few months ago, pretty much almost everybody is affected, but most people don't run into the issue until they try to install something that depends on libc6, like you are trying to.

I've already helped at least 3 people with this issue.

You simply have to downgrade your 9.3 version to the 9.2 version. Try the following command (thanks to xenopeek again for the solution):

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apt install --simulate $(dpkg -l | egrep '(libc|locales|nscd).* 2.31-0ubuntu9.3 ' | cut -d' ' -f3 | paste -sd ' ' | sed -r 's/( |$)/=2.31-0ubuntu9.2 /g')

Notice the --simulate option, so this command won't actually install anything. I put it there for safety, just in case the command tries to remove packages and break your system.

Read the output carefully. If the command does not report removing anything, only downgrades the few packages, then you can safely remove the --simulate and run the command.

[tie_mann]

That did it! I was able to install openfoam9 successfully (no removed packages, just 6 downgraded).

Thanks for your help!