# Why do I always get stuck installing more than 340 packages when compiling ParaView on Ubuntu 20
**URL:** https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800
**Category:** ParaView Support
**Created:** [August 11, 2021, 8:02am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800 "2021-08-11T08:02:10Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@aquanaut](https://discourse.paraview.org/u/aquanaut)
#### Post date: [August 11, 2021, 8:02am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/1 "2021-08-11T08:02:10Z")
like the title.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 11, 2021, 8:04am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/2 "2021-08-11T08:04:22Z")
Not a ParaView question.
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### Author:  [@aquanaut](https://discourse.paraview.org/u/aquanaut)
#### Post date: [August 11, 2021, 8:08am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/3 "2021-08-11T08:08:58Z")
I want to compile Paraview from source with openvdb([https://gitlab.kitware.com/vtk/vtk/-/merge\_requests/8024](https://gitlab.kitware.com/vtk/vtk/-/merge_requests/8024)) converting writer but always get stuck in the processing.Please help me.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 11, 2021, 8:11am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/4 "2021-08-11T08:11:53Z")
> Why do I always get stuck installing more than 340 packages when compiling ParaView on Ubuntu 20
Because ParaView has many dependencies, however 340 seems a bit too much, which package are you installing ?
> but always get stuck in the processing
Please share your error and edit the title of this topic to reflect your actual question
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### Author:  [@aquanaut](https://discourse.paraview.org/u/aquanaut)
#### Post date: [August 11, 2021, 9:13am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/5 "2021-08-11T09:13:09Z")
There in no error output.Just get stuck when building …cxx.o[348/20699] and mouse can not be moved.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 11, 2021, 9:14am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/6 "2021-08-11T09:14:43Z")
You are running out of memory, probably during VTKm compilation. Reduce the number of process you are using.
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### Author:  [@aquanaut](https://discourse.paraview.org/u/aquanaut)
#### Post date: [August 11, 2021, 9:20am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/7 "2021-08-11T09:20:08Z")
ninja -j2 ?
How to reduce the number of process?
git clone --recursive [https://gitlab.kitware.com/paraview/paraview.git](https://gitlab.kitware.com/paraview/paraview.git)
mkdir paraview\_build
cd paraview\_build
cmake -GNinja -DPARAVIEW\_USE\_PYTHON=ON -DPARAVIEW\_USE\_MPI=ON -DVTK\_SMP\_IMPLEMENTATION\_TYPE=TBB -DCMAKE\_BUILD\_TYPE=Release …/paraview
ninja
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 11, 2021, 9:21am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/8 "2021-08-11T09:21:49Z")
ninja -j2 is indeed the way to fix this.
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### Author:  [@aquanaut](https://discourse.paraview.org/u/aquanaut)
#### Post date: [August 11, 2021, 9:30am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/9 "2021-08-11T09:30:32Z")
Get stuck again.I will try in other computer.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 11, 2021, 9:31am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/10 "2021-08-11T09:31:09Z")
ninja -j 1 ?
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### Author:  [@aquanaut](https://discourse.paraview.org/u/aquanaut)
#### Post date: [August 11, 2021, 10:30am UTC](https://discourse.paraview.org/t/why-do-i-always-get-stuck-installing-more-than-340-packages-when-compiling-paraview-on-ubuntu-20/7800/11 "2021-08-11T10:30:36Z")
It’s the computer’s problem.