# Error trying to use MPI
**URL:** https://fortran-lang.discourse.group/t/error-trying-to-use-mpi/4863
**Category:** Help
**Created:** [December 6, 2022, 9:19pm UTC](https://fortran-lang.discourse.group/t/error-trying-to-use-mpi/4863 "2022-12-06T21:19:21Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@jaoc12](https://fortran-lang.discourse.group/u/jaoc12)
#### Post date: [December 6, 2022, 9:19pm UTC](https://fortran-lang.discourse.group/t/error-trying-to-use-mpi/4863/1 "2022-12-06T21:19:21Z")
Dear Community,
I recently installed OpenMPI with.
```auto
sudo apt install openmpi-bin openmpi-common openmpi-doc libopenmpi3 libopenmpi-dev
```
I’ve an Ubuntu machine with gfortran installed.
```auto
gfortran --version
GNU Fortran (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
```
, while my conda distribution is,
```auto
which conda
/home/usuario/anaconda3/bin/conda
```
When trying to run this test program,
```auto
program main
use mpi_f08
call MPI_Init()
print *, "test"
call MPI_Finalize()
end program main
```
I get the following error
```auto
mpif90 main.f90
/home/usuario/anaconda3/bin/mpif90: line 376: x86_64-conda_cos6-linux-gnu-gfortran: command not found
```
Any advice would be very welcomed.
Kind rgds
Jose
---
### Author:  [@everythingfunctional](https://fortran-lang.discourse.group/u/everythingfunctional)
#### Post date: [December 6, 2022, 10:22pm UTC](https://fortran-lang.discourse.group/t/error-trying-to-use-mpi/4863/2 "2022-12-06T22:22:28Z")
Hi @jaoc12 , welcome to the Discourse and Fortran.
I think I see the issue. You’ve installed openmpi with your system package manager, but you’re using the Conda installed mpif90, but don’t seem to have installed gfortran via Conda. Basically, a mix-up of different installation and execution environments. I’d suggest you probably don’t need Conda just yet, as the system installed openmpi and gfortran should work just fine together.
---
### Author:  [@jaoc12](https://fortran-lang.discourse.group/u/jaoc12)
#### Post date: [December 9, 2022, 10:50am UTC](https://fortran-lang.discourse.group/t/error-trying-to-use-mpi/4863/3 "2022-12-09T10:50:24Z")
Many thanks @everythingfunctional .
Indeed, when I launch the terminal, I’m inside a conda environment by default (==\>`(base) user@xxx: ~/)`.
Inside such environemnt, when I run `mpirun --version,` I get
```auto
HYDRA build details:
Version: 3.3.2
```
However, if I exit the conda environemnt (`conda deactivate)` ==\> `user@xxx: ~/)`, and run mpirun --version`, I get
```auto
mpirun (Open MPI) 4.1.2
```
Question now, how do I change the MPI that conda is using? In its .bashrc file?
---
### Author:  [@everythingfunctional](https://fortran-lang.discourse.group/u/everythingfunctional)
#### Post date: [December 9, 2022, 2:54pm UTC](https://fortran-lang.discourse.group/t/error-trying-to-use-mpi/4863/4 "2022-12-09T14:54:39Z")
I don’t use Conda, so I’m not sure. Perhaps someone else can help with that. For now you can probably just exit the Conda environment and things will work.
---
### Author:  [@CRquantum](https://fortran-lang.discourse.group/u/CRquantum)
#### Post date: [December 10, 2022, 9:52am UTC](https://fortran-lang.discourse.group/t/error-trying-to-use-mpi/4863/5 "2022-12-10T09:52:40Z")
I think on ubuntu, you only need one command like below
```auto
sudo apt install gfortran mpich
```
then it will automatically install gfortran and configure it correctly with MPI. It never fails me. You may try.
Perhaps
```auto
sudo apt install gfortran openmpi
```
also works.
---
### Author:  [@jaoc12](https://fortran-lang.discourse.group/u/jaoc12)
#### Post date: [December 10, 2022, 11:57am UTC](https://fortran-lang.discourse.group/t/error-trying-to-use-mpi/4863/6 "2022-12-10T11:57:30Z")
Thxs both
Indeed, I installed MPICH as part of a hydrodynamic simulation package. (GADGET4) That may be the reason why is the default MPI compiler when in a conda environment.
Kind rgds
Jose