I tried using synaptics and managed to remove the packages but ./deviceQuery is still showing cuda 10.0 instead of 11.0
Below is the output to dpkg -l |grep cuda
ii cuda-11-0 11.0.3-1 amd64 CUDA 11.0 meta-package
ii cuda-command-line-tools-11-0 11.0.3-1 amd64 CUDA command-line tools
ii cuda-compat-11-0 450.102.04-1 amd64 CUDA Compatibility Platform
ii cuda-compiler-11-0 11.0.3-1 amd64 CUDA compiler
ii cuda-cudart-11-0 11.0.221-1 amd64 CUDA Runtime native Libraries
ii cuda-cudart-dev-11-0 11.0.221-1 amd64 CUDA Runtime native dev links, headers
ii cuda-cuobjdump-11-0 11.0.221-1 amd64 CUDA cuobjdump
ii cuda-cupti-11-0 11.0.221-1 amd64 CUDA profiling tools runtime libs.
ii cuda-cupti-dev-11-0 11.0.221-1 amd64 CUDA profiling tools interface.
ii cuda-demo-suite-11-0 11.0.167-1 amd64 Demo suite for CUDA
ii cuda-documentation-11-0 11.0.228-1 amd64 CUDA documentation
ii cuda-driver-dev-11-0 11.0.221-1 amd64 CUDA Driver native dev stub library
ii cuda-drivers 460.32.03-1 amd64 CUDA Driver meta-package, branch-agnostic
ii cuda-drivers-460 460.32.03-1 amd64 CUDA Driver meta-package, branch-specific
ii cuda-gdb-11-0 11.0.221-1 amd64 CUDA-GDB
ii cuda-gdb-src-11-0 11.0.221-1 amd64 Contains the source code for cuda-gdb
ii cuda-libraries-11-0 11.0.3-1 amd64 CUDA Libraries 11.0 meta-package
ii cuda-libraries-dev-11-0 11.0.3-1 amd64 CUDA Libraries 11.0 development meta-package
ii cuda-memcheck-11-0 11.0.221-1 amd64 CUDA-MEMCHECK
ii cuda-minimal-build-11-0 11.0.3-1 amd64 Minimal CUDA 11.0 toolkit build packages.
ii cuda-nsight-11-0 11.0.221-1 amd64 CUDA nsight
ii cuda-nsight-compute-11-0 11.0.3-1 amd64 NVIDIA Nsight Compute
ii cuda-nsight-systems-11-0 11.0.3-1 amd64 NVIDIA Nsight Systems
ii cuda-nvcc-11-0 11.0.221-1 amd64 CUDA nvcc
ii cuda-nvdisasm-11-0 11.0.221-1 amd64 CUDA disassembler
ii cuda-nvml-dev-11-0 11.0.167-1 amd64 NVML native dev links, headers
ii cuda-nvprof-11-0 11.0.221-1 amd64 CUDA Profiler tools
ii cuda-nvprune-11-0 11.0.221-1 amd64 CUDA nvprune
ii cuda-nvrtc-11-0 11.0.221-1 amd64 NVRTC native runtime libraries
ii cuda-nvrtc-dev-11-0 11.0.221-1 amd64 NVRTC native dev links, headers
ii cuda-nvtx-11-0 11.0.167-1 amd64 NVIDIA Tools Extension
ii cuda-nvvp-11-0 11.0.221-1 amd64 CUDA Profiler tools
ii cuda-runtime-11-0 11.0.3-1 amd64 CUDA Runtime 11.0 meta-package
ii cuda-samples-11-0 11.0.221-1 amd64 CUDA example applications
ii cuda-sanitizer-11-0 11.0.221-1 amd64 CUDA Sanitizer
ii cuda-toolkit-11-0 11.0.3-1 amd64 CUDA Toolkit 11.0 meta-package
ii cuda-tools-11-0 11.0.3-1 amd64 CUDA Tools meta-package
ii cuda-visual-tools-11-0 11.0.3-1 amd64 CUDA visual tools