Not enough space on /tmp for Matlab install? No problem.

linux-fs-namespace-workaround.txt

Problem scenario: 
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1) stupid Matlab installer wants to download several gigabytes into your /tmp directory.
2) You don't have "several gigabytes" available on your root partition (where /tmp is). The installer warns you and/or fails.
3) You DO have available disk space, but on some other disk/partition/wherever.


Solution:
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Run the command inside Linux filesystem namespace. For example:

  sudo unshare --mount -- \
    /bin/bash -c "mount -o bind,noexec,nosuid,nodev /foobar/tmp /tmp && sudo -u your_username ./matlab_R2018b_glnxa64/install"
    
So now the installer process runs as usual, but all writes into /tmp are actually written into /foobar/tmp,
which has lots and lots of space available. The installer succeeds. Hooray!


More info
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  man namespaces
  man unshare