From 9006de4b10ceb5d6ecded13d432dec36b94ea727 Mon Sep 17 00:00:00 2001
From: murraybj <129555910+murraybj@users.noreply.github.com>
Date: Wed, 2 Oct 2024 15:42:59 -0400
Subject: [PATCH] retry adding ipopt

---
 .github/workflows/main.yml                                   | 5 ++++-
 .../Pyomo Fundamentals/2.1 Knapsack problem with rules.ipynb | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7497258d..034d6c4c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -28,6 +28,10 @@ jobs:
         sudo apt update
         sudo apt-get install -y -qq glpk-utils
         sudo apt-get install -y -qq coinor-cbc
+
+    - name: install ipopt
+      run: |
+        sudo apt update
         sudo pip install idaes-pse --pre
         idaes get-extensions --to ./solvers
 
@@ -42,7 +46,6 @@ jobs:
         pip install -r requirements.txt
         pip install openpyxl
 
-
     # (optional) Cache your executed notebooks between runs
     # if you have config:
     # execute:
diff --git a/Material/Pyomo Fundamentals/2.1 Knapsack problem with rules.ipynb b/Material/Pyomo Fundamentals/2.1 Knapsack problem with rules.ipynb
index fd31acfd..cd3bfc37 100644
--- a/Material/Pyomo Fundamentals/2.1 Knapsack problem with rules.ipynb	
+++ b/Material/Pyomo Fundamentals/2.1 Knapsack problem with rules.ipynb	
@@ -59,7 +59,7 @@
     "    return sum( w[i]*m.x[i] for i in A ) <= W_max\n",
     "model.weight_con = pyo.Constraint(rule=weight_con_rule)\n",
     "\n",
-    "opt = pyo.SolverFactory('glpk')\n",
+    "opt = pyo.SolverFactory('cbc')\n",
     "opt_success = opt.solve(model)\n",
     "\n",
     "model.pprint()"