Description of problem: On chromium, I try to download the pdf file
https://pctsadmin.princeton.edu/upload/document/d5bc67548f32e8aabe5134ede4f8f15f.pdf
All I get is a black screen with an unhappy puzzle piece and no error message. If I try to download it with wget I have
wget https://pctsadmin.princeton.edu/upload/document/d5bc67548f32e8aabe5134ede4f8f15f.pdf
--2020-12-07 09:38:32--  https://pctsadmin.princeton.edu/upload/document/d5bc67548f32e8aabe5134ede4f8f15f.pdf
Resolving pctsadmin.princeton.edu (pctsadmin.princeton.edu)... 128.112.86.19
Connecting to pctsadmin.princeton.edu (pctsadmin.princeton.edu)|128.112.86.19|:443... connected.
ERROR: cannot verify pctsadmin.princeton.edu's certificate, issued by ‘CN=InCommon RSA Server CA,OU=InCommon,O=Internet2,L=Ann Arbor,ST=MI,C=US’:
  Unable to locally verify the issuer's authority.
To connect to pctsadmin.princeton.edu insecurely, use `--no-check-certificate'.

I am assuming that the reason chromium cannot download the pdf is because of a non-existant root certificate for the site. 
On the other hand google-chrome has no trouble downloading that site, which suggestes that google-chrome has root certificates that chromium does not. How to get them into chromium?

I tried moving .configure/google-chrome/Safe Browsing/ contents to chromium/Safe Browsing, but that did not help. Is there something else I should be trying? Or is this totally uninformative error on Chromium indicating something else? (Note that the pdf file DOES exist.
On Konqueror I get the error 

263.90kB/s    0:00:00 (xfr#13, to-chk=1/15)
UrlUws.store
The server failed the authenticity check (pctsadmin.princeton.edu).
The certificate authority's certificate is invalid
The certificate cannot be verified for internal reasons

On Firefox it works. 

Surely there must be a way of getting a better list of certificate authories from Chrome of Firefox and inserting it into Chromium.



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