dpkg dependencies problem

I'm having problem upgrading my Debian 10 Linux machine. After I input the sudo apt update && upgrade and all downloaded completed, I ran into dependencies problem that I ought to have fix by sudo apt --fix-broken install but still run into following error:

E: Invalid archive signature
E: Internal error, could not locate member control.tar.{zstlz4gzxzbz2lzma}
E: Prior errors apply to /var/cache/apt/archives/libpolkit-agent-1-0_0.105-30_amd64.deb
debconf: apt-extracttemplates failed: No such file or directory
dpkg-deb: error: '/var/cache/apt/archives/libpolkit-agent-1-0_0.105-30_amd64.deb' is not a Debian format archive
dpkg: error processing archive /var/cache/apt/archives/libpolkit-agent-1-0_0.105-30_amd64.deb (--unpack):
 dpkg-deb --control subprocess returned error exit status 2
Errors were encountered while processing:
 /var/cache/apt/archives/libpolkit-agent-1-0_0.105-30_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)*****

The dependencies will never allow me to install any package on my terminal anymore unless I clear the unpacking dependencies problem.