@crispyoz Thanks. It'd be great for Onion to see that they can build on 20.04 out of the box. It is obviously doable.

Config file entry should be:

@crispyoz Thanks! It resolve the problem. Regards!

I spent a week trying different configurations to solve this issue, the two main docker platforms I list below: Windows 10 running linux docker container Ubuntu 18.04 LTS running linux docker container The final result on both platforms were consistent: libwebsockets.h not found error Mosquitto build fails Not enough space available on the container Workarounds (note: this works on a failed container Increase the default docker container size allocated by the docker daemon form 20Gb to 40Gb. I found the final build is 20.7Gb total and takes about 7 hours on Windows and 4 hours on Ubuntu...Give or take. This is done by modifying the docker daemon.json file. docker attach <container ID> (note: CTRL-p CTRL-Q to SIGKILL) Attach to the docker container and use VIM to modify the .config file and: a. Search for all instances of the keyword "mosquitto" and comment them out from the build configuration. If you need mosquitto, you'll have to find another way around the issue. note: I recommend addding the "is not used" value after commenting out the line vim .config make menuconfig Either run make menuconfig to add libwebsockets library and the libwesockets examples to the build configuration. Or while you're modifying the .config file, do a search using VIM for libwebsockets and add the library and examples to the build. note: I built libwebsockets library by [using an * in menuconfig or =y in .config they are accomplishing the same thing] and set the libwebsockets examples [M in menuconfig or =m in .config] make -j1 V=s Run make [options] inside of the attached container. Docker automatically creates several intermediate containers when necessary and I found that using a Dockerfile can be problematic for Cross-Compile build process. Optional Build: use my Dockerfile This workaround definitely builds on Windows 10 and Ubuntu 18.04 but it's not for the faint of heart! Happy Hacking!

We have quite a bit of content on cross-compilation that should make your life easier: Documentation article: https://docs.onion.io/omega2-docs/cross-compiling.html Video tutorial: https://www.youtube.com/watch?v=VOs75UsGe_o Article series detailing how to cross compile: Setting up the Build system: https://onion.io/2bt-cross-compiling-c-programs-part-1/ Cross Compiling Programs: https://onion.io/2bt-cross-compiling-programs/ Cross Compiling Programs that use External Libraries: https://onion.io/2bt-cross-compiling-c-programs-part-3/ The jist of it is that you'll need to use the Build System to do your cross compiling. If you need a separate library for your program, it will first have to be built by the build system before you can include it in your program.

I have exactly this problem. I moved the omega2+ to a similar computer. Both have ubuntu 14.04 LTS. It works OK on one but not on the other.

@Jackdaw2 HEY i am noob and i have no idea how to do all this. do you have some free time to chat on how to solve my problem? i have a made a program with c# in visual studio on my windows10 machine. i want to know how i can run it or re code it on my omega 2+. is it even possible? thank you

@Jimmy-Chan said in How to boot up Omega2+ with Ubuntu linux?: Is there a way to have my Omega2+ boot up with Ubuntu via the external sd card? I just want to use ubuntu because I want to make use of Swift. Thanks! It's possible to run Debian "on top" of preinstalled OpenWRT: http://community.onion.io/topic/2394/installing-debian-on-omega2-board

fyi I had the same problem on a fresh install of ubuntu 14, no USB devices listed. But after some time when i tried again it simply worked by itself.