Intel Devstack-OpenCL unable to detect PAC Cards

yes, I have followed the same steps. The problem occurs the same.

The following is the output when I try to uninstall and reinstall the BSP:

server2@ubuntu:~$ aocl uninstall
Do you want to unset the FCD at directory /opt/Intel/OpenCL/Boards [Y/n] Y
aocl uninstall: /home/server2/inteldevstack/a10_gx_pac_ias_1_2_1_pv/opencl/opencl_bsp is not installed, no need to uninstall.
server2@ubuntu:~$ aocl install
Do you want to setup the FCD at directory /opt/Intel/OpenCL/Boards [Y/n] n
Please specify a directory to setup FCD:
/home/server2/inteldevstack/a10_gx_pac_ias_1_2_1_pv/opencl/opencl_bsp/
aocl install: Setting up the FPGA Client Driver (FCD) to the system. This process may require admin privilege
Install the FCD file to /home/server2/inteldevstack/a10_gx_pac_ias_1_2_1_pv/opencl/opencl_bsp
aocl install: Adding the board package /home/server2/inteldevstack/a10_gx_pac_ias_1_2_1_pv/opencl/opencl_bsp to the list of installed packages
Installing the board package driver to the system.
aocl install: Running install from /home/server2/inteldevstack/a10_gx_pac_ias_1_2_1_pv/opencl/opencl_bsp/linux64/libexec
server2@ubuntu:~$ aocl list-devices
--------------------------------------------------------------------
Warning:
No devices attached for package:
/opt/intelFPGA_pro/quartus_19.2.0b57/hld/board/a10_ref
--------------------------------------------------------------------