AttributeError: 'module' object has no attribute 'run'

i try to install this on Ubuntu 14.04 LTS and got this error:

$ sudo snap install --classic riseup-vpn
error: cannot perform the following tasks:
- Run install hook of "riseup-vpn" snap if present (run hook "install": 
-----
Traceback (most recent call last):
  File "/snap/riseup-vpn/89/meta/hooks/install", line 17, in <module>
    release = subprocess.run(['cat', '/etc/os-release'], stdout=subprocess.PIPE).stdout
AttributeError: 'module' object has no attribute 'run'
-----)
$

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