I'm trying in a totally fresh environment on Ubuntu 20:
```
cd Downloads/
mkdir temp
cd temp
wget
https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.shchmod +x Miniconda3-latest-Linux-x86_64.sh
./Miniconda3-latest-Linux-x86_64.sh
eval "$(/home/user/Downloads/temp/deleteme/bin/conda shell.bash hook)"
conda create -n asdf
conda activate asdf
conda config --env --add channels conda-forge
conda config --env --set channel_priority strict
conda install gnuradio=3.8.2
gr_modtool newmod
```
Here is the output of `conda list`:
````
# packages in environment at /home/jcollins/Downloads/temp/deleteme/envs/asdf:
#
# Name Version Build Channel
_libgcc_mutex 0.1 conda_forge conda-forge
_openmp_mutex 4.5 2_gnu conda-forge
adwaita-icon-theme 41.0 ha770c72_1 conda-forge
alsa-lib 1.2.3.2 h166bdaf_0 conda-forge
at-spi2-atk 2.38.0 h0630a04_3 conda-forge
at-spi2-core 2.40.3 h0630a04_0 conda-forge
atk-1.0 2.36.0 h3371d22_4 conda-forge
attr 2.5.1 h166bdaf_0 conda-forge
boost-cpp 1.74.0 h6cacc03_7 conda-forge
brotlipy 0.7.0 py39hb9d737c_1004 conda-forge
bzip2 1.0.8 h7f98852_4 conda-forge
ca-certificates 2022.6.15 ha878542_0 conda-forge
cairo 1.16.0 ha12eb4b_1010 conda-forge
certifi 2022.6.15 py39hf3d152e_0 conda-forge
cffi 1.15.1 py39he91dace_0 conda-forge
charset-normalizer 2.1.0 pyhd8ed1ab_0 conda-forge
click 8.1.3 py39hf3d152e_0 conda-forge
click-plugins 1.1.1 py_0 conda-forge
codec2 0.9.2 h7f98852_1 conda-forge
cryptography 37.0.4 py39hd97740a_0 conda-forge
dbus 1.13.6 h5008d03_3 conda-forge
epoxy 1.5.10 h166bdaf_1 conda-forge
expat 2.4.8 h27087fc_0 conda-forge
fftw 3.3.10 nompi_h77c792f_102 conda-forge
font-ttf-dejavu-sans-mono 2.37 hab24e00_0 conda-forge
font-ttf-inconsolata 3.000 h77eed37_0 conda-forge
font-ttf-source-code-pro 2.038 h77eed37_0 conda-forge
font-ttf-ubuntu 0.83 hab24e00_0 conda-forge
fontconfig 2.14.0 h8e229c2_0 conda-forge
fonts-conda-ecosystem 1 0 conda-forge
fonts-conda-forge 1 0 conda-forge
freetype 2.10.4 h0708190_1 conda-forge
fribidi 1.0.10 h36c2ea0_0 conda-forge
gdk-pixbuf 2.42.8 hff1cb4f_0 conda-forge
gettext 0.19.8.1 h73d1719_1008 conda-forge
glib 2.72.1 h6239696_0 conda-forge
glib-tools 2.72.1 h6239696_0 conda-forge
gnuradio 3.8.2.0 py39h81c97bc_8 conda-forge
gnuradio-core 3.8.2.0 py39h62466b6_8 conda-forge
gnuradio-grc 3.8.2.0 py39hc76a25d_8 conda-forge
gnuradio-qtgui 3.8.2.0 py39hbc3867e_8 conda-forge
gnuradio-uhd 3.8.2.0 py39h33996e5_8 conda-forge
gnuradio-video-sdl 3.8.2.0 py39hc76a25d_8 conda-forge
gnuradio-zeromq 3.8.2.0 py39h72561b3_8 conda-forge
graphite2 1.3.13 h58526e2_1001 conda-forge
gsl 2.6 he838d99_2 conda-forge
gst-plugins-base 1.20.2 hcf0ee16_0 conda-forge
gstreamer 1.20.3 hd4edc92_0 conda-forge
gstreamer-orc 0.4.32 h7f98852_1 conda-forge
gtk3 3.24.33 h13ada96_1 conda-forge
harfbuzz 4.2.0 h40b6f09_0 conda-forge
hicolor-icon-theme 0.17 ha770c72_2 conda-forge
icu 69.1 h9c3ff4c_0 conda-forge
idna 3.3 pyhd8ed1ab_0 conda-forge
importlib-metadata 4.11.4 py39hf3d152e_0 conda-forge
jack 1.9.18 hfd4fe87_1001 conda-forge
jpeg 9e h166bdaf_2 conda-forge
keyutils 1.6.1 h166bdaf_0 conda-forge
krb5 1.19.3 h3790be6_0 conda-forge
ld_impl_linux-64 2.36.1 hea4e1c9_2 conda-forge
lerc 4.0.0 h27087fc_0 conda-forge
libblas 3.9.0 15_linux64_openblas conda-forge
libcap 2.64 ha37c62d_0 conda-forge
libcblas 3.9.0 15_linux64_openblas conda-forge
libclang 13.0.1 default_hc23dcda_0 conda-forge
libcups 2.3.3 hf5a7f15_1 conda-forge
libdb 6.2.32 h9c3ff4c_0 conda-forge
libdeflate 1.12 h166bdaf_0 conda-forge
libedit 3.1.20191231 he28a2e2_2 conda-forge
libevent 2.1.10 h9b69904_4 conda-forge
libffi 3.4.2 h7f98852_5 conda-forge
libflac 1.3.4 h27087fc_0 conda-forge
libgcc-ng 12.1.0 h8d9b700_16 conda-forge
libgfortran-ng 12.1.0 h69a702a_16 conda-forge
libgfortran5 12.1.0 hdcd56e2_16 conda-forge
libgirepository 1.72.0 h26ff761_1 conda-forge
libglib 2.72.1 h2d90d5f_0 conda-forge
libgomp 12.1.0 h8d9b700_16 conda-forge
libiconv 1.16 h516909a_0 conda-forge
liblapack 3.9.0 15_linux64_openblas conda-forge
libllvm13 13.0.1 hf817b99_2 conda-forge
libnsl 2.0.0 h7f98852_0 conda-forge
libogg 1.3.4 h7f98852_1 conda-forge
libopenblas 0.3.20 pthreads_h78a6416_1 conda-forge
libopus 1.3.1 h7f98852_1 conda-forge
libpng 1.6.37 h753d276_3 conda-forge
libpq 14.4 hd77ab85_0 conda-forge
librsvg 2.52.5 h0a9e6e8_3 conda-forge
libsndfile 1.0.31 h9c3ff4c_1 conda-forge
libsodium 1.0.18 h36c2ea0_1 conda-forge
libstdcxx-ng 12.1.0 ha89aaad_16 conda-forge
libtiff 4.4.0 h0d92c0b_2 conda-forge
libtool 2.4.6 h9c3ff4c_1008 conda-forge
libudev1 249 h166bdaf_4 conda-forge
libusb 1.0.26 h0b4f0b6_100 conda-forge
libuuid 2.32.1 h7f98852_1000 conda-forge
libvorbis 1.3.7 h9c3ff4c_0 conda-forge
libwebp-base 1.2.3 h166bdaf_2 conda-forge
libxcb 1.13 h7f98852_1004 conda-forge
libxkbcommon 1.0.3 he3ba5ed_0 conda-forge
libxml2 2.9.12 h885dcf4_1 conda-forge
libxslt 1.1.33 h0ef7038_3 conda-forge
libzlib 1.2.12 h166bdaf_2 conda-forge
log4cpp 1.1.3 h9c3ff4c_1003 conda-forge
lxml 4.8.0 py39hb9d737c_2 conda-forge
lz4-c 1.9.3 h9c3ff4c_1 conda-forge
mako 1.2.1 pyhd8ed1ab_0 conda-forge
markupsafe 2.1.1 py39hb9d737c_1 conda-forge
mpir 3.0.0 hf484d3e_1002 conda-forge
mysql-common 8.0.29 haf5c9bc_1 conda-forge
mysql-libs 8.0.29 h28c427c_1 conda-forge
ncurses 6.3 h27087fc_1 conda-forge
nspr 4.32 h9c3ff4c_1 conda-forge
nss 3.78 h2350873_0 conda-forge
numpy 1.23.1 py39hba7629e_0 conda-forge
openssl 1.1.1q h166bdaf_0 conda-forge
pango 1.50.7 hbd2fdc8_0 conda-forge
pcre 8.45 h9c3ff4c_0 conda-forge
pip 22.2.1 pyhd8ed1ab_0 conda-forge
pixman 0.40.0 h36c2ea0_0 conda-forge
portaudio 19.6.0 hae3ed74_4 conda-forge
pthread-stubs 0.4 h36c2ea0_1001 conda-forge
pulseaudio 14.0 hbc9ff1d_7 conda-forge
pycairo 1.21.0 py39h0934665_1 conda-forge
pycparser 2.21 pyhd8ed1ab_0 conda-forge
pygobject 3.42.2 py39habf54e5_0 conda-forge
pyopenssl 22.0.0 pyhd8ed1ab_0 conda-forge
pyqt 5.12.3 py39hf3d152e_8 conda-forge
pyqt-impl 5.12.3 py39hde8b62d_8 conda-forge
pyqt5-sip 4.19.18 py39he80948d_8 conda-forge
pyqtchart 5.12 py39h0fcd23e_8 conda-forge
pyqtwebengine 5.12.1 py39h0fcd23e_8 conda-forge
pysocks 1.7.1 py39hf3d152e_5 conda-forge
python 3.9.13 h9a8a25e_0_cpython conda-forge
python_abi 3.9 2_cp39 conda-forge
pyyaml 6.0 py39hb9d737c_4 conda-forge
pyzmq 23.2.0 py39headdf64_0 conda-forge
qt 5.12.9 h1304e3e_6 conda-forge
qwt 6.1.6 h7ec6b3e_0 conda-forge
readline 8.1.2 h0f457ee_0 conda-forge
requests 2.28.1 pyhd8ed1ab_0 conda-forge
sdl 1.2.52 h27087fc_1 conda-forge
sdl2 2.0.22 h55ee7ae_2 conda-forge
setuptools 63.3.0 py39hf3d152e_0 conda-forge
six 1.16.0 pyh6c4a22f_0 conda-forge
sqlite 3.39.2 h4ff8645_0 conda-forge
tk 8.6.12 h27826a3_0 conda-forge
tzdata 2022a h191b570_0 conda-forge
uhd 3.15.0.0 py39h3524f2f_8 conda-forge
urllib3 1.26.11 pyhd8ed1ab_0 conda-forge
volk 2.4.1 h9c3ff4c_3 conda-forge
wheel 0.37.1 pyhd8ed1ab_0 conda-forge
xorg-fixesproto 5.0 h7f98852_1002 conda-forge
xorg-inputproto 2.3.2 h7f98852_1002 conda-forge
xorg-kbproto 1.0.7 h7f98852_1002 conda-forge
xorg-libice 1.0.10 h7f98852_0 conda-forge
xorg-libsm 1.2.3 hd9c2040_1000 conda-forge
xorg-libx11 1.7.2 h7f98852_0 conda-forge
xorg-libxau 1.0.9 h7f98852_0 conda-forge
xorg-libxdmcp 1.1.3 h7f98852_0 conda-forge
xorg-libxext 1.3.4 h7f98852_1 conda-forge
xorg-libxfixes 5.0.3 h7f98852_1004 conda-forge
xorg-libxi 1.7.10 h7f98852_0 conda-forge
xorg-libxrender 0.9.10 h7f98852_1003 conda-forge
xorg-libxtst 1.2.3 h7f98852_1002 conda-forge
xorg-recordproto 1.14.2 h7f98852_1002 conda-forge
xorg-renderproto 0.11.1 h7f98852_1002 conda-forge
xorg-xextproto 7.3.0 h7f98852_1002 conda-forge
xorg-xproto 7.0.31 h7f98852_1007 conda-forge
xz 5.2.5 h516909a_1 conda-forge
yaml 0.2.5 h7f98852_2 conda-forge
zeromq 4.3.4 h9c3ff4c_1 conda-forge
zipp 3.8.0 pyhd8ed1ab_0 conda-forge
zlib 1.2.12 h166bdaf_2 conda-forge
zstd 1.5.2 h8a70e8d_2 conda-forge