I have done some other tests.
I have the same problem on a clean install of 18.04 with Displaylink 5.3 but Displaylink 5.2 can be installed without trouble.
Libdrm-dev seems to have been updated very recently. I think this is the problem and that's why the driver can't be installed anymore on a clean install.
I can't suceed to install the previous version of the libdrm-dev package but maybe it can solve the problem.
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