# URSim - NO CONTROLLER error with missing xmlrpc library

**URL:** <https://forum.universal-robots.com/t/ursim-no-controller-error-with-missing-xmlrpc-library/2829>\
**Category:** URCap Development\
**Tags:** ursim, linux\
**Created:** [September 28, 2018, 7:27am UTC](https://forum.universal-robots.com/t/ursim-no-controller-error-with-missing-xmlrpc-library/2829 "2018-09-28T07:27:05Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![anon27046260](https://avatars.discourse-cdn.com/v4/letter/a/4af34b/32.png) [@anon27046260](https://forum.universal-robots.com/u/anon27046260)\
**Post date:** [November 29, 2018, 5:28pm UTC](https://forum.universal-robots.com/t/ursim-no-controller-error-with-missing-xmlrpc-library/2829/7 "2018-11-29T17:28:18Z")

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I just installed a new computer. I have one working perfectly with ubuntu 16 but I used ubuntu 18 for this new computer.

I installed everything and tried all I could found on the forum and can’t get the error "Segmentation fault (core dumped) away from the URControl if I’m not running it as root.

So, these are some information I noticed if that can help find a solution. In my case, I will install Ubuntu16 for now.

See below debugger :

```
Starting program: /home/gub/ursim/ursim-5.1.2.40245/URControl 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0xf7a56b40 (LWP 8059)]

Thread 1 "URControl" received signal SIGSEGV, Segmentation fault.
0x0804f430 in ?? ()
(gdb) bt
#0 0x0804f430 in ?? ()
#1 0x0805175d in ?? ()
#2 0xf7a73e81 in __libc_start_main () from /lib/i386-linux-gnu/libc.so.6
#3 0x0804f281 in ?? ()
```

I also noticed that on ubuntu18 when you install the ursim, it’s removing the package “libcurl4” to install “libcurl3” but apparently libxmlrpc-core-c3 depends on libcurl4 ( The following packages have unmet dependencies:  
libxmlrpc-core-c3 : Depends: libcurl4 (\>= 7.16.2) but it is not going to be installed) can this cause some kind of conflicts?

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