Encountered the “cd:/content:invalid signature” error today installing OpenSuse.  The error presented itself selecting installation from the boot menu on the dvd.  All of the following failed to help – re burning the ISO, downloading the ISO over, verified the MD5 checksum, burnt the ISO again, and still the same issue.  The cause of the issue ended up being incorrect date settings in the bios.  After changing the time and date settings to the correct ones (it was off by several years) the installation continued as normal.

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