I didn't think of that ... in the mean time I found a thread where the libstdc++5 was extracted from an amd64 package and this seems to work (but alas I did not find the thread back otherwise I would have posted it here).
I think it should be useful to update the https://help.ubuntu.com/community/Ha...inters#Lexmark page to include your suggestion : it would be, I'm sure, greatly appreciated by people trying to install such kind of printers.
How can we achieve that ?
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