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wget and curl behind corporate proxy throws certificate is not trusted or certificate doesn't have a known issuer

If you try to run wget or curl in Ununtu/Debian behind corporate proxy, you might receive errors like: 
ERROR: The certificate of 'apertium.projectjj.com' is not trusted.
ERROR: The certificate of 'apertium.projectjj.com' doesn't have a known issuer.

wget https://apertium.projectjj.com/apt/apertium-packaging.public.gpg
ERROR: cannot verify apertium.projectjj.com's certificate, issued by 'emailAddress=proxyteam@corporate.proxy.com,CN=diassl.corporate.proxy.com,OU=Division UK,O=Group name,L=Company,ST=GB,C=UK':
  Unable to locally verify the issuer's authority.
To connect to apertium.projectjj.com insecurely, use `--no-check-certificate'.
To solution is to install your company's CA certificate in Ubuntu.
  1. In Windows, open the first part of URL in your web browser. e.g. open https://apertium.projectjj.com in web browser.
  2. If you inspect the certifcate, you will see the same CN (diassl.corporate.proxy.com), as reported by the error above
  3. Run certmgr.msc in Windows Run dialog.
  4. Open Trusted Root Certification Authorities > Certificates
  5. Find the certificate with name / issued by values ame as CN above.
  6. Right click it > All Tasks > Export as Base64 encoded X.509 (cer). Note: .crt and .cer are same thing as long as you export as base64. Its a Windows thing its nothing to do with the file.
  7. Rename the file's extension to .crt (Any other extension won't be accepted by Ubuntu).
  8. Copy the certificate.crt to Ubuntu box and install it: 
       mkdir /usr/local/share/ca-certificates/company
   cp certificate.crt /usr/local/share/ca-certificates/company/
   chmod -R 755 /usr/local/share/ca-certificates/company
   sudo update-ca-certificates
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Location: London, UK

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