I attempted to install FreeCAD on my Linux Mint 20.3 Cinnamon system. Command I used:
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sudo add-apt-repository ppa:freecad-maintainers/freecad-stable
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You are about to add the following PPA:
This PPA repository hosts stable releases of FreeCAD for all supported versions of Ubuntu in 32 and 64-Bit architecture. These packages are more up to date than those found on the Ubuntu repositories.
Note: the freecad-doc package brings offline FreeCAD help support, and needs to be installed separately..
Note: the ccx package brings CalculiX support to the FEM workbench, and needs to be installed separately.
More info: https://launchpad.net/~freecad-maintainers/+archive/ubuntu/freecad-stable
Press Enter to continue or Ctrl+C to cancel
Executing: /tmp/apt-key-gpghome.L5ypsyPY1U/gpg.1.sh --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys 83193AA3B52FF6FCF10A1BBF005EAE8119BB5BCA
gpg: key 005EAE8119BB5BCA: public key "Launchpad PPA for FreeCAD maintainers" imported
gpg: Total number processed: 1
gpg: imported: 1
gpg: invalid key resource URL '/tmp/apt-key-gpghome.L5ypsyPY1U/home:manuelschneid3r.asc.gpg'
gpg: keyblock resource '(null)': General error
gpg: key 7721F63BD38B4796: 2 signatures not checked due to missing keys
gpg: key 1488EB46E192A257: 1 signature not checked due to a missing key
gpg: key BDF3F6ACD4D81407: 1 signature not checked due to a missing key
gpg: key 1488EB46E192A257: 1 signature not checked due to a missing key
gpg: key A6616109451BBBF2: 12 signatures not checked due to missing keys
gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys
gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys
gpg: key C8CAB6595FDFF622: 2 signatures not checked due to missing keys
gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key
gpg: Total number processed: 29
gpg: skipped new keys: 29
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Get:30 http://ppa.launchpad.net/openscad/releases/ubuntu focal InRelease [18.1 kB]
Err:30 http://ppa.launchpad.net/openscad/releases/ubuntu focal InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 176F9F68AD382CA4