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Does your 1.7.3 kernel start the right julia binary?

You should have files for your jupyter kernels, perhaps in /home/user/.local/share/jupyter/kernels/.../kernel.json, that tell jupyter how to start the kernel.

My kernel.json file for my julia kernel contains

{
  "display_name": "Julia 1.7.2",
  "argv": [
    "/home/johan/Julia/julia-1.7.2/bin/julia",
    "-i",
    "--color=yes",
    "/home/johan/.julia/packages/IJulia/AQu2H/src/kernel.jl",
    "{connection_file}"
  ],
  "language": "julia",
  "env": {
    "JULIA_NUM_THREADS": "8"
  },
  "interrupt_mode": "signal"
}

which refers to a julia-executable /home/johan/Julia/julia-1.7.2/bin/julia.

If your kernel.json for the kernel that is named 1.7.3 refers to the correct binary file, then I do now know what might be the reason for your problem.

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