# Is it possible to use Nextflow with the \`libmamba\` conda solver?

**URL:** <https://community.seqera.io/t/is-it-possible-to-use-nextflow-with-the-libmamba-conda-solver/181>\
**Category:** Ask for help\
**Created:** [October 20, 2023, 9:40am UTC](https://community.seqera.io/t/is-it-possible-to-use-nextflow-with-the-libmamba-conda-solver/181 "2023-10-20T09:40:55Z")\
**Posts on this page:** 1\
**Showing post:** 4

<div class="post-metadata">

**Author:** ![mribeirodantas](https://dub1.discourse-cdn.com/flex013/user_avatar/community.seqera.io/mribeirodantas/32/235_2.png) [@mribeirodantas](https://community.seqera.io/u/mribeirodantas)\
**Post date:** [October 22, 2023, 2:24pm UTC](https://community.seqera.io/t/is-it-possible-to-use-nextflow-with-the-libmamba-conda-solver/181/4 "2023-10-22T14:24:45Z")

</div>

Hey, James!

Yes, you can. I can’t reproduce your error.

I did the following:

```auto
conda update -n base conda
conda install -n base conda-libmamba-solver
conda config --set solver libmamba

```

I confirmed with `conda config --get solver`, which returned `--set solver libmamba`. `conda config --show` also confirmed it, but much more verbose 😆

Then, I created a new folder and added the following Nextflow script:

```groovy
process FOO {
  conda 'fastqc'
  debug true

  output:
  stdout

  script:
  """
  fastqc --version
  """
}

workflow {
  FOO()
}

```

Ran with `NXF_VER=23.04.1 nextflow run main.nf -with-conda` and got as output the following:

```auto
CAPSULE: Downloading dependency io.nextflow:nextflow:jar:23.04.1
CAPSULE: Downloading dependency io.nextflow:nf-httpfs:jar:23.04.1
CAPSULE: Downloading dependency io.nextflow:nf-commons:jar:23.04.1
Nextflow 23.10.0 is available - Please consider updating your version to it
dN E X T F L O W ~ version 23.04.1
Launching `main.nf` [loving_cray] DSL2 - revision: e432c2850d
executor > local (1)
[d2/28d2f3] process > FOO [100%] 1 of 1 ✔
Creating env using conda: fastqc [cache /Users/mribeirodantas/conda-test/work/conda/env-23037893fdd4cef8d4acc5fe82ba1899]
FastQC v0.12.1

```

PS: I tried running `nextflow run nf-core/taxprofiler -profile conda,test -r 1.1.1 --outdir ./results` as you did, and it works past the `NFCORE_TAXPROFILER:TAXPROFILER:LONGREAD_HOSTREMOVAL:MINIMAP2_INDEX'` step so for some reason I can’t reproduce this either.

```auto
[bf/e48529] process > NFCORE_TAXPROFILER:TAXPROFILER:LONGREAD_HOSTREMOVAL:MINIMAP2_INDEX [100%] 1 of 1 ✔

```

I didn’t wait for it to finish, though.

**I would guess this issue is related to your conda version. I’m using v23.9.**

---

_[View the full topic](https://community.seqera.io/t/is-it-possible-to-use-nextflow-with-the-libmamba-conda-solver/181)._