my-vault/00_Inbox/Clippings/2023/03/How do I install a root certificate - Ask Ubuntu.md

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page-title	url	date
How do I install a root certificate? - Ask Ubuntu	https://askubuntu.com/questions/73287/how-do-i-install-a-root-certificate	2023-03-30 16:38:30

[

](https://askubuntu.com/users/31155/sparky1)

4

Given a CA certificate file foo.crt, follow these steps to install it on Ubuntu:

1. Create a directory for extra CA certificates in /usr/local/share/ca-certificates:

   sudo mkdir /usr/local/share/ca-certificates/extra
   

2. Copy the CA .crt file to this directory:

   sudo cp foo.crt /usr/local/share/ca-certificates/extra/foo.crt
   

3. Let Ubuntu add the .crt file's path relative to /usr/local/share/ca-certificates to /etc/ca-certificates.conf:

   sudo dpkg-reconfigure ca-certificates
   

   To do this non-interactively, run:

   sudo update-ca-certificates
   

In case of a .pem file on Ubuntu, it must first be converted to a .crt file:

openssl x509 -in foo.pem -inform PEM -out foo.crt

Or a .cer file can be converted to a .crt file:

openssl x509 -inform DER -in foo.cer -out foo.crt

[

](https://askubuntu.com/users/618353/beastofcaerbannog)

answered Jan 12, 2012 at 12:37