[Ubuntu-x-swat] [Bug 1881062] Re: Mouse pointer disappeared after upgrade

I am sorry that I forgot the files from dmesg and Xorg.0.log. And right after sending this bug report I read some articles in AskUbuntu. I installed Ubuntu by UEFI mode when the bug happened, and I found no use of UEFI for me. Then I reinstalled by Legacy mode and meantime I erased everything when

[Ubuntu-x-swat] [Bug 1881062] [NEW] Mouse pointer disappeared after upgrade

Public bug reported: Mouse vendor: Elecom Mouse name: Deft M-DT20R S/N 99011158 S/N 9700261B I have two sets of this model and both are not working any more. Wireless USB mouse stopped working after 'sudo apt upgrade' on 0:00 UTC 28th May 2020. I also upgraded BIOS of ThinkStation P500 from