Hello Feng Kai-Heng.  I'm sorry, but I do not know what the last kernel version was running before the problem began.  I never gave it a thought. After looking at it, I would imagine it was 5.4.0-54.60 but that could be wrong.  Should I attempt to install that older version?  Just in case it is useful I will post the full list of Kernels on the machine below.  Thanks again for your help and Happy New Year!  

rc  linux-image-4.18.0-15-generic                 4.18.0-15.16~18.04.1                  amd64        Signed kernel image generic
rc  linux-image-5.0.0-23-generic                  5.0.0-23.24~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.0.0-25-generic                  5.0.0-25.26~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.0.0-27-generic                  5.0.0-27.28~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.0.0-29-generic                  5.0.0-29.31~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.0.0-31-generic                  5.0.0-31.33~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.0.0-32-generic                  5.0.0-32.34~18.04.2                   amd64        Signed kernel image generic
rc  linux-image-5.0.0-36-generic                  5.0.0-36.39~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.0.0-37-generic                  5.0.0-37.40~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.3.0-26-generic                  5.3.0-26.28~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.3.0-28-generic                  5.3.0-28.30~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.3.0-40-generic                  5.3.0-40.32~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.3.0-45-generic                  5.3.0-45.37~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.3.0-46-generic                  5.3.0-46.38~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.3.0-51-generic                  5.3.0-51.44~18.04.2                   amd64        Signed kernel image generic
rc  linux-image-5.3.0-53-generic                  5.3.0-53.47~18.04.1                   amd64        Signed kernel image generic
rc  linux-image-5.4.0-33-generic                  5.4.0-33.37                           amd64        Signed kernel image generic
rc  linux-image-5.4.0-37-generic                  5.4.0-37.41                           amd64        Signed kernel image generic
rc  linux-image-5.4.0-39-generic                  5.4.0-39.43                           amd64        Signed kernel image generic
rc  linux-image-5.4.0-40-generic                  5.4.0-40.44                           amd64        Signed kernel image generic
rc  linux-image-5.4.0-42-generic                  5.4.0-42.46                           amd64        Signed kernel image generic
rc  linux-image-5.4.0-52-generic                  5.4.0-52.57                           amd64        Signed kernel image generic
rc  linux-image-5.4.0-53-generic                  5.4.0-53.59                           amd64        Signed kernel image generic
rc  linux-image-5.4.0-54-generic                  5.4.0-54.60                           amd64        Signed kernel image generic
ii  linux-image-5.4.0-56-generic                  5.4.0-56.62                           amd64        Signed kernel image generic
ii  linux-image-5.4.0-58-generic                  5.4.0-58.64                           amd64        Signed kernel image generic
ii  linux-image-generic                           5.4.0.58.61                           amd64        Generic Linux kernel image