I had experienced a serious system crash this morning:
After the failed update, I got a kernel panic which I saw rarely.
I ended up restoring one month old disk image (made with Clonezilla).
The following are the error messages I saw during the failed update process:
cannot copy extracted data for './usr/lib/i386-linux-gnu/libnvidia-glvkspirv.so.470.86' to '/usr/lib/i386-linux-gnu/libnvidia-glvkspirv.so.470.86.dpkg-new': unexpected end of file or stream
cannot copy extracted data for './usr/src/nvidia-470.86/nvidia/nv-kernel.o_binary' to '/usr/src/nvidia-470.86/nvidia/nv-kernel.o_binary.dpkg-new': unexpected end of file or stream
dependency problems - leaving unconfigured
0.2392:package libnvidia-gl-470:amd64 470.86-0ubuntu0.20.04.1 cannot be configured because libnvidia-gl-470:i386 is at a different version (470.82.00-0ubuntu0.20.04.1)
61.7225:dependency problems - leaving unconfigured
After the restoration of the drive, I switched the GPU driver to an open source Nouveau before applying the update. It worked 
My current kernel version is as follows:
5.11.0-41-generic #45~20.04.1-Ubuntu
I decided to stay away from a proprietary Nvidia driver for now, since I am not a gamer and I do not feel any difference using Nouveau.



