error cannot create /usr/lib/python3.7/site-packages/future (read only)

Used the command python3 -m pip install 'python-language-server[all]' from shell
Began to download all files then ......

error: could not create '/usr/lib/python3.7/site-packages/future': Read-only file system

----------------------------------------
Command "/usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/var/tmp/pip-install-26clqf0l/future/setup.py';f=geta
ttr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" i
nstall --record /var/tmp/pip-record-2nziy40f/install-record.txt --single-version-externally-managed --compile" failed with e
rror code 1 in /var/tmp/pip-install-26clqf0l/future/

首先重现报告中的 `python3 -m pip install 'python-language-server[all]'` 命令，并检查将 `future` 安装到 `/usr/lib/python3.7/site-packages` 时出现的失败。完成问题诊断后，如果已在项目中修复安装问题，或已记录受支持的安装路径，则该 issue 即完成。

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