From fc7f04d1d87396eb7d639132e6401859f2767974 Mon Sep 17 00:00:00 2001
From: Fabian Neumann <fabian.neumann@outlook.de>
Date: Fri, 25 Sep 2020 14:53:17 +0200
Subject: [PATCH] travis: switch solver installation back to conda

---
 .travis.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index ba00fe2a..f08cd97e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,8 +20,8 @@ before_install:
   - conda activate pypsa-eur
 
   # install open-source solver
-  - mamba install -c conda-forge ipopt
   - mamba install -c conda-forge glpk
+  - conda install -c conda-forge ipopt
 
   # list packages for easier debugging
   - conda list