# Cmdstan(py) for Ubuntu 22.04

**URL:** <https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300>\
**Category:** Interfaces\
**Tags:** cmdstanpy\
**Created:** [April 28, 2022, 5:30pm UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300 "2022-04-28T17:30:28Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![aakhmetz](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/aakhmetz/32/18672_2.png) [@aakhmetz](https://discourse.mc-stan.org/u/aakhmetz)\
**Post date:** [April 28, 2022, 5:30pm UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300/1 "2022-04-28T17:30:28Z")

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I am wondering if someone was successful with running the cmdstan on Ubuntu 22.04. I tried, but it looks not good to me: Bernoulli example compiles with no problem, but then I almost always get:

```nohighlight
CmdStan's precompiled header (PCH) files may need to be rebuilt.If your model failed to compile please run cmdstanpy.rebuild_cmdstan().

```

One code I managed to run sometime ago. But now it gives the same error.

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**Author:** ![rok\_cesnovar](https://avatars.discourse-cdn.com/v4/letter/r/7bcc69/32.png) [@rok\_cesnovar](https://discourse.mc-stan.org/u/rok_cesnovar)\
**Post date:** [April 28, 2022, 5:33pm UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300/2 "2022-04-28T17:33:12Z")

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Does the message persist after you rebuild CmdStan?

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**Author:** ![aakhmetz](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/aakhmetz/32/18672_2.png) [@aakhmetz](https://discourse.mc-stan.org/u/aakhmetz)\
**Post date:** [April 29, 2022, 2:35am UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300/3 "2022-04-29T02:35:22Z")

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Yes. However, if I build from source files, then everything is good! I used the git to clone

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**Author:** ![aakhmetz](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/aakhmetz/32/18672_2.png) [@aakhmetz](https://discourse.mc-stan.org/u/aakhmetz)\
**Post date:** [April 29, 2022, 3:56am UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300/4 "2022-04-29T03:56:49Z")

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No, it works still badly - sometimes it compiles, sometimes it does not want to compile. Sometimes, if I clean-up the previously generated directories, it helps.

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**Author:** ![rok\_cesnovar](https://avatars.discourse-cdn.com/v4/letter/r/7bcc69/32.png) [@rok\_cesnovar](https://discourse.mc-stan.org/u/rok_cesnovar)\
**Post date:** [April 29, 2022, 4:41am UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300/5 "2022-04-29T04:41:48Z")

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What compiler are you using and what version?

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**Author:** ![aakhmetz](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/aakhmetz/32/18672_2.png) [@aakhmetz](https://discourse.mc-stan.org/u/aakhmetz)\
**Post date:** [April 29, 2022, 4:44am UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300/6 "2022-04-29T04:44:58Z")

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clang++ (I could not build with g++)

ps: the last time rebuild helped (but the behavior is a bit random to me, I will continue to observe)

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**Author:** ![lucasmoschen](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/lucasmoschen/32/12851_2.png) [@lucasmoschen](https://discourse.mc-stan.org/u/lucasmoschen)\
**Post date:** [May 27, 2022, 3:16pm UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300/7 "2022-05-27T15:16:39Z")

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@aakhmetz you said you could not build with g++. I am a newbie in Cmdstanpy and after installing it through `conda`, the installation process of `cmdstan` did not finish. Is this problem happening with you? I am also a Ubuntu 22.04 user.

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**Author:** ![aakhmetz](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/aakhmetz/32/18672_2.png) [@aakhmetz](https://discourse.mc-stan.org/u/aakhmetz)\
**Post date:** [May 28, 2022, 3:55am UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300/8 "2022-05-28T03:55:12Z")

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I would advice just to download the source file of cmdstan and build it manually. Then you would see the problem from the terminal

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**Author:** ![WardBrian](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/wardbrian/32/12078_2.png) [@WardBrian](https://discourse.mc-stan.org/u/WardBrian)\
**Post date:** [May 28, 2022, 10:10pm UTC](https://discourse.mc-stan.org/t/cmdstan-py-for-ubuntu-22-04/27300/9 "2022-05-28T22:10:56Z")

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If you installed `cmdstanpy` from conda, you should not need to separately install cmdstan