When you run MPM, the executable writes data to the temporary directory defined by your machine's TMPDIR environment variable. If this directory is not writable, you will encounter this error.
To avoid this error, pass a different temporary directory to mpm by setting the TMPDIR environment variable to a directory you have write access to. For example:
TMPDIR=~/mytmpdir ./mpm install ...
For more information on modifying environment variables, please see the following support article:
How do I set add or change environment variables?
