source ./init_opencl.sh takes a long time?

Hi,I plan to execute opencl demo on de10-standard,the Linux https://alteraforum.com/forum/attachment.php?attachmentid=14609&stc=1 https://alteraforum.com/forum/attachment.php?attachmentid=14609&stc=1 can boot normaly，but when I use command "source ./init_opencl.sh" to load opencl linux kernel driver and setup env variable,the terminal don‘t have any response for a long time.