Citrix Workspace/Receiver SSL error 61 on Linux/Ubuntu
If you encounter this error, it is because the cert store used by Citrix Workspace is independent of that of OS/browser. Therefore, you must copy the trusted root CA or intermediate CA files to:
/opt/Citrix/ICAClient/keystore/cacerts
If you don't want to waste time to download the root CA files from their issuer, one quick way is to use those in Firefox:
sudo cp /usr/share/ca-certificates/mozilla/*
/opt/Citrix/ICAClient/keystore/cacerts
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