# NLP is not solving in ubuntu OS whereas It is solving in Windows OS with all versions of package and Julia is same (Juniper optimzer with Ipopt and HiGHS)

**URL:** <https://discourse.julialang.org/t/nlp-is-not-solving-in-ubuntu-os-whereas-it-is-solving-in-windows-os-with-all-versions-of-package-and-julia-is-same-juniper-optimzer-with-ipopt-and-highs/92866>\
**Category:** Optimization (Mathematical)\
**Tags:** question\
**Created:** [January 12, 2023, 10:54am UTC](https://discourse.julialang.org/t/nlp-is-not-solving-in-ubuntu-os-whereas-it-is-solving-in-windows-os-with-all-versions-of-package-and-julia-is-same-juniper-optimzer-with-ipopt-and-highs/92866 "2023-01-12T10:54:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Balakumar\_A](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/balakumar_a/32/45805_2.png) [@Balakumar\_A](https://discourse.julialang.org/u/Balakumar_A)\
**Post date:** [January 12, 2023, 10:54am UTC](https://discourse.julialang.org/t/nlp-is-not-solving-in-ubuntu-os-whereas-it-is-solving-in-windows-os-with-all-versions-of-package-and-julia-is-same-juniper-optimzer-with-ipopt-and-highs/92866/1 "2023-01-12T10:54:49Z")

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I am trying to Solve a Non Linear model using Juniper with Ipopt and GiGHS. I am getting solution in my windows operating system, whereas Ubuntu OS is not giving any results immediately as it is saying NLP couldn’t solve optimally and No Integral solution found. I am using julia 1.6.1 in both OS and sampe packages with same version. Please find the log below for same model and help me out.

Windows OS:  
Status of relaxation: LOCALLY\_SOLVED  
Time for relaxation: 81.11199998855591  
Relaxation Obj: 7444.76604825103

```
   MIPobj NLPobj Time

```

=============================================  
Presolving model  
257 rows, 160 cols, 514 nonzeros  
65 rows, 64 cols, 130 nonzeros  
0 rows, 0 cols, 0 nonzeros  
Presolve: Optimal

Solving report  
Status Optimal  
Primal bound 11.1231861754  
Dual bound 11.1231861754  
Gap 0% (tolerance: 0.01%)  
Solution status feasible  
11.1231861754 (objective)  
0 (bound viol.)  
0 (int. viol.)  
0 (row viol.)  
Timing 0.01 (total)  
0.01 (presolve)  
0.00 (postsolve)  
Nodes 0  
LP iterations 0 (total)  
0 (strong br.)  
0 (separation)  
0 (heuristics)  
11.1232 0.0 25.2

FP: 73.69899988174438 s  
FP: 1 round  
FP: Obj: 7445.767441685866  
Obj: 7445.767441685866

Ubuntu OS:

Start values are not feasible.  
Status of relaxation: LOCALLY\_SOLVED  
Time for relaxation: 135.4964361190796  
Relaxation Obj: 7444.653740204127

```
   MIPobj NLPobj Time

```

=============================================  
Presolving model  
257 rows, 160 cols, 514 nonzeros  
65 rows, 64 cols, 130 nonzeros  
0 rows, 0 cols, 0 nonzeros  
Presolve: Optimal

Solving report  
Status Optimal  
Primal bound 11.1229585924  
Dual bound 11.1229585924  
Gap 0% (tolerance: 0.01%)  
Solution status feasible  
11.1229585924 (objective)  
0 (bound viol.)  
0 (int. viol.)  
0 (row viol.)  
Timing 0.00 (total)  
0.00 (presolve)  
0.00 (postsolve)  
Nodes 0  
LP iterations 0 (total)  
0 (strong br.)  
0 (separation)  
0 (heuristics)  
┌ Warning: NLP couldn’t be solved to optimality  
└ @ Juniper ~/.julia/packages/Juniper/0Z1vO/src/fpump.jl:405  
11.123 - 53.5

FP: 53.602248191833496 s  
FP: 1 round  
FP: No integral solution found

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**Author:** ![ufechner7](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ufechner7/32/51363_2.png) [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Post date:** [January 12, 2023, 12:42pm UTC](https://discourse.julialang.org/t/nlp-is-not-solving-in-ubuntu-os-whereas-it-is-solving-in-windows-os-with-all-versions-of-package-and-julia-is-same-juniper-optimzer-with-ipopt-and-highs/92866/2 "2023-01-12T12:42:52Z")

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Can you provide a piece of code that allows us to reproduce your problem?

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**Author:** ![John\_Gibson](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/john_gibson/32/5321_2.png) [@John\_Gibson](https://discourse.julialang.org/u/John_Gibson)\
**Post date:** [January 12, 2023, 1:00pm UTC](https://discourse.julialang.org/t/nlp-is-not-solving-in-ubuntu-os-whereas-it-is-solving-in-windows-os-with-all-versions-of-package-and-julia-is-same-juniper-optimzer-with-ipopt-and-highs/92866/3 "2023-01-12T13:00:02Z")

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Have a look at this article. It outlines all the things that help people answer help requests.

> [@Please read: make it easier to help you](https://discourse.julialang.org/t/please-read-make-it-easier-to-help-you/14757):
>
> Welcome to the Julia Discourse! We are enthusiastic about helping Julia programmers, both beginner and experienced. This public service announcement (PSA) outlines best practices when asking for help. Following these points makes it easier for us to help you and more likely you’ll get a prompt, useful answer. Keywords are highlighted to make it easier to refer to specific points. Choose a descriptive title that captures the key part of your question, eg “plots with multiple axes” instead of …

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**Author:** ![sylvaticus](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sylvaticus/32/203883_2.png) [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Post date:** [January 12, 2023, 2:56pm UTC](https://discourse.julialang.org/t/nlp-is-not-solving-in-ubuntu-os-whereas-it-is-solving-in-windows-os-with-all-versions-of-package-and-julia-is-same-juniper-optimzer-with-ipopt-and-highs/92866/4 "2023-01-12T14:56:30Z")

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To “be sure” that the versions are the same, you should create an environment specific to this project in one of the two OS, run the code and then copy the whole folder including Manifest.toml and Project.toml in the other OS, run `Pgk.instantiate()` and run the model again.