Lintian tag information: copyright-file-contains-full-gpl-license (type: error)

Description (from lintian-explain-tags)

The copyright file /usr/share/doc/*pkg*/copyright contains the complete
text of the GPL v1, v2, or v3. It should refer to the file
/usr/share/common-licenses/GPL-1, GPL-2, or GPL-3 instead.

Please refer to Copyright information (Section 12.5) in the Debian Policy
Manual for details.

Visibility: error
Show-Always: no
Check: debian/copyright

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