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Then make sure your compiler (/usr/bin/cc) matches the version used to build your kernel (e.g., atm for kernel 5.4.x installed on Ubuntu using ukuu it has to be 9.2.1) and build+install the dkms module:
sudo dkms install evdi/5.2.14
I've written a patch for 5.2.14 dkms module for Linux 5.4.x compatibility: https://gist.github.com/alllexx88/1aebabd49da990089a489cb4f5c94698
You can apply it as follows:
wget -q -O- https://gist.githubusercontent.com/alllexx88/1aebabd49da990089a489cb4f5c94698/raw/c0856b2ab2d15f534686f8bbaa8ee48e8d93b4d6/DisplayLink-5.2.14-Linux-5.4.patch | sudo patch -p1 -d /usr/src/evdi-5.2.14
Then make sure your compiler (/usr/bin/cc) matches the version used to build your kernel (e.g., atm for kernel 5.4.x installed on Ubuntu using ukuu it has to be 9.2.1) and build+install the dkms module:
sudo dkms install evdi/5.2.14