conda install -n <ENV> ipykernel -c conda-forge --force-reinstall -y
for all envs:
for name in $(ls ~/.conda/envs); do conda install -n $name ipykernel -c conda-forge --force-reinstall -y; done
conda env export -n <OLD_ENV> --no-builds -f environment.yml
conda env create -n <NEW_ENV> -f environment.yml
conda env export -n <OLD_ENV> --from-history -f environment.yml