Can't open editor -- can't load library "libprotobuf.so". libprotobuf.so: cannot open shared object file: No such file or directory - Can't open editor -- can't load library "libprotobuf.so". libprotobuf.so: cannot open shared object file: No such file or directory Description Due to a problem in the Quartus® Prime Software version 15.1 for Linux, you may see this missing library error when you open the Stand-Alone Programmer. Resolution To work around this problem, create the symbolic link libprotobuf.so -> libprotobuf.so.8.0.0 in quartus/linux64 directory with the following command: ln -s libprotobuf.so libprotobuf.so.8.0.0 This problem is scheduled to be fixed in a future version of the Quartus Prime software. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 15.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']