If you run into a "Certificate Authentication Failed" error after installing the Launcher this is how you fix it. open terminal
1) cd /usr/share/ca-certificates/
2) mkdir custom
3) nano /usr/share/ca-certificates/custom/Thawte_CS_CA_G2.crt
4) insert:
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
5) cltr+x to save and exit
6) echo 'custom/Thawte_CS_CA_G2.crt' >> /etc/ca-certificates.conf
7) update-ca-certificates
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