# Arpack in Ubuntu
**URL:** https://discourse.julialang.org/t/arpack-in-ubuntu/59795
**Category:** New to Julia
**Created:** [April 22, 2021, 11:05am UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795 "2021-04-22T11:05:39Z")
**Posts on this page:** 13
**Page:** 1
### Author:  [@MARIANO\_SIMON\_ARNAIZ](https://discourse.julialang.org/u/MARIANO_SIMON_ARNAIZ)
#### Post date: [April 22, 2021, 11:05am UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/1 "2021-04-22T11:05:39Z")
Hi everyone… I wonder if you can help me with the usage of Arpack in Ubuntu… it works great in Mac (wrapping the arpack I installed with homebrew). But I have installed it in Ubuntu and won’t work
I get this when I try to run the example:
```julia
julia> using LinearAlgebra, Arpack
julia> A = Diagonal(1:4);
julia> λ, ϕ = eigs(A, nev = 2);
ERROR: ┌ Error: XYAUPD_Exception: Please check XYAUPD error codes in the ARPACK manual.
│ info = 4294967286
└ @ Arpack ~/.julia/packages/Arpack/7qkR1/src/libarpack.jl:24
Stacktrace:
[1] aupd_wrapper(::Type{T} where T, ::Arpack.var"#18#28"{Diagonal{Float64,Array{Float64,1}}}, ::Arpack.var"#19#29", ::Arpack.var"#20#30", ::Int64, ::Bool, ::Bool, ::String, ::Int64, ::Int64, ::String, ::Float64, ::Int64, ::Int64, ::Array{Float64,1}) at /home/user/.julia/packages/Arpack/7qkR1/src/libarpack.jl:92
[2] _eigs(::Diagonal{Float64,Array{Float64,1}}, ::UniformScaling{Bool}; nev::Int64, ncv::Int64, which::Symbol, tol::Float64, maxiter::Int64, sigma::Nothing, v0::Array{Float64,1}, ritzvec::Bool, explicittransform::Symbol) at /home/user/.julia/packages/Arpack/7qkR1/src/Arpack.jl:235
[3] #eigs#10 at /home/user/.julia/packages/Arpack/7qkR1/src/Arpack.jl:47 [inlined]
[4] #eigs#14 at /home/user/.julia/packages/Arpack/7qkR1/src/Arpack.jl:54 [inlined]
[5] #eigs#9 at /home/user/.julia/packages/Arpack/7qkR1/src/Arpack.jl:46 [inlined]
[6] top-level scope at none:1
```
---
### Author:  [@ImreSamu](https://discourse.julialang.org/u/ImreSamu)
#### Post date: [April 22, 2021, 11:29am UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/2 "2021-04-22T11:29:47Z")
Your example - works for me:
- Ubuntu 20.04.2 LTS (Focal Fossa)
- :julia: Version 1.5.0 (2020-08-01)
- Architecture: x86\_64
```julia
julia> versioninfo()
Julia Version 1.5.0
Commit 96786e22cc (2020-08-01 23:44 UTC)
Platform Info:
OS: Linux (x86_64-pc-linux-gnu)
CPU: Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-9.0.1 (ORCJIT, skylake)
```
What is your
- Julia `versioninfo()`?
- ubuntu version?
---
### Author:  [@marianoarnaiz](https://discourse.julialang.org/u/marianoarnaiz)
#### Post date: [April 22, 2021, 3:04pm UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/3 "2021-04-22T15:04:52Z")
How did you installed it? I get the same problem.
I am on Ubuntu 20.04 and Julia 1.5.3
---
### Author:  [@ImreSamu](https://discourse.julialang.org/u/ImreSamu)
#### Post date: [April 22, 2021, 3:30pm UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/4 "2021-04-22T15:30:54Z")
> How did you installed it?
- julia from → [Download Julia](https://julialang.org/downloads/)
- `(@v1.5) pkg> add LinearAlgebra, Arpack`
and
```julia
(@v1.5) pkg> st
...
[7d9fca2a] Arpack v0.4.0
[37e2e46d] LinearAlgebra
...
```
---
### Author:  [@mike\_k](https://discourse.julialang.org/u/mike_k)
#### Post date: [April 22, 2021, 3:44pm UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/5 "2021-04-22T15:44:15Z")
Your example works for me as well on Ubuntu 20.04 and Julia 1.5.3.
I just created a new project environment and only added the `LinearAlgebra` and `Arpack` packages as described by @ImreSamu .
```julia
(foonctions) pkg> st
Status `~/foonctions/Project.toml`
[7d9fca2a] Arpack v0.5.2
[37e2e46d] LinearAlgebra
```
Maybe there is a conflict with some other package (?).
---
### Author:  [@marianoarnaiz](https://discourse.julialang.org/u/marianoarnaiz)
#### Post date: [April 22, 2021, 6:40pm UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/6 "2021-04-22T18:40:41Z")
I think my problem is with Arpack. How did you installed it in ubuntu?
---
### Author:  [@ufechner7](https://discourse.julialang.org/u/ufechner7)
#### Post date: [April 22, 2021, 6:57pm UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/7 "2021-04-22T18:57:22Z")
There is no need to install Arpack manually. Arpack\_jll is installed automatically as dependency of Arpack.jl
---
### Author:  [@marianoarnaiz](https://discourse.julialang.org/u/marianoarnaiz)
#### Post date: [April 23, 2021, 8:59am UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/8 "2021-04-23T08:59:02Z")
Hi all.
I am still getting the same problem. Maybe is the Julia version?
---
### Author:  [@marianoarnaiz](https://discourse.julialang.org/u/marianoarnaiz)
#### Post date: [April 23, 2021, 9:00am UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/9 "2021-04-23T09:00:39Z")
I have Arpack v0.5.1 … maybe the version is conflicting with something?
---
### Author:  [@ImreSamu](https://discourse.julialang.org/u/ImreSamu)
#### Post date: [April 23, 2021, 10:23am UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/10 "2021-04-23T10:23:41Z")
> [@marianoarnaiz](#):
>
> I have Arpack v0.5.1 … maybe the version is conflicting with something?
try to reinstall the Arpack package
- `remove Arpack`
- `update` ( update all packages )
- `add Arpack`
- `precompile`
---
### Author:  [@giordano](https://discourse.julialang.org/u/giordano)
#### Post date: [April 23, 2021, 10:33am UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/11 "2021-04-23T10:33:48Z")
> [@marianoarnaiz](#):
>
> Maybe is the Julia version?
Maybe I missed it, but I don’t think you told how you installed Julia on Ubuntu? Did you use the official binaries of the package from Ubuntu repositories?
---
### Author:  [@ufechner7](https://discourse.julialang.org/u/ufechner7)
#### Post date: [April 23, 2021, 1:04pm UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/12 "2021-04-23T13:04:09Z")
Best way to install Julia on Ubuntu:
```julia
bash -ci "$(curl -fsSL https://raw.githubusercontent.com/abelsiqueira/jill/master/jill
```
Never do:
```julia
apt-get install julia
```
That’s a recipe to get into trouble.
---
### Author:  [@marianoarnaiz](https://discourse.julialang.org/u/marianoarnaiz)
#### Post date: [April 25, 2021, 1:22pm UTC](https://discourse.julialang.org/t/arpack-in-ubuntu/59795/13 "2021-04-25T13:22:04Z")
Julia Pro