double vertical line in print

Version: 2.1.2 Compiler: GNU GCC 6.2.0 Compiled on: Sep 17 2016 Qt Version: 5.9.5 Boost Version: 1.62.0 System: Ubuntu 18.04.4 LTS printed horizontal line is single line, but printed vertical line is splitted and double line, please help.

Can you please make a test file and upload it with a picture of the print?
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Armin

I just resolve the problem with driver reinstallation for printer.

Thank you for your answer.