Sdkmanager_0.9.14-4964_amd64.deb shows incomplete screen, can't select options nor hit CONTINUE

sdkmanager_0.9.14-4964_amd64.deb shows incomplete screen, can’t select options near the bottom of the screen nor hit CONTINUE (because it is greyed out).

I reported this problem earlier this year. Attempted install of 18.04 upgrade yesterday resulted in incomplete booting, hence this attempt to recover

Please refer to the suggestions at https://devtalk.nvidia.com/default/topic/1065303/jetson-tx2/unable-to-intsall-os-on-jetson-tx2/post/5395864/#5395864