All reports of copyright-should-refer-to-common-license-file-for-gpl for the archive. The extended description of this tag is:
The strings "GNU General Public License" or "GPL" appear in the copyright file for this package, but the copyright file does not reference /usr/share/common-licenses as the location of the GPL on Debian systems.
If the package uses some other license that just mentions the GPL and that Lintian should detect as an exception, please file a Lintian bug. If the copyright file must mention the GPL for reasons other than stating the license of the package, please add a Lintian override.
Refer to Debian Policy Manual section 12.5 (Copyright information) for details.
This tag has not been emitted in any package tested by Lintian.