Julia kernel of Jupyter

I unintentionally removed Julia kernel from Jupyter note book. after that I tried the code ] build IJulia to get that kernel back to Jupyter but it did not worked out and the Julia kernel folder is not created after several attempts.
Any help is appreciate, by the way I am new to Julia and my operating system is ubuntu20

I don’t know if this would work, but you could try to delete the ~/.julia/compiled/IJulia/ folder, then rebuild before trying using IJulia. Make sure you’ve closed any open instances of Julia first.