I tried opening the latest in QGIS 2.18.13 on Mac and it seemed ok. It's having problems reading the metadata.txt file which is what QGIS plugins use to describe themselves.
This is probably caused by either
- a line getting corrupted in the metadata.txt file. Try uninstalling this plugin and reinstalling it, and restarting QGIS.
- attempting to open a QGIS2 plugin manually into QGIS3 (this isn't listed as a QGIS3 plugin)
- a platform specific glitch in Linux
You could try installing an earlier version manually from here, go the versions tab. Try the second most recent version (3.0.11 at the time of writing).
The most recent version had a change in that part of the file so it's possible that your version of QGIS for Linux doesn't like the latest version (maybe the multiple-line plugin description?)
It's probably a good idea to raise a bug in the issue tracker but you'd need to specify which version of QGIS (and plugin) is affected.