edit: note for others, this instruction is incomplete, please read rest of thread.
you don’t need to install graphics drivers for intel cards. those are already open source and included with the linux kernel.
it does also not matter which ubuntu base you take, all packages should be available somehow, so you can even install another kernel with another ubuntu.
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try to start star conflict manually from a command shell. what does it write?
cd “~/.steam/steam/SteamApps/common/star conflict” && ./StarConflict
(&& is just there because i wrote two commands in one line, you can enter them separately after each other and press enter)
- maybe you miss libraries. maybe your system misses opengl stuff (as mentioned). maybe your card doesnt do 3d. hard to say.
type “ldd StarConflict” in the same folder, to get a list of all the libraries the app uses. is anyone there missing (libcurl and libudev are allowed to miss)
thats LDD written with small letters. you can use it on any executable, it will tell you the libraries it uses.
- check “glxinfo” command output, do you have 3d acceleration? (needs the mesa-utils package)
search the output of this tool for “direct rendering: Yes” or “No”, quicker way:
glxinfo | grep "direct rendering"
btw. you can also use the tool “glxgears” from the same package, which displays some rotating gears, and writes the frames per second into the terminal, to see, if graphics are accelerated. wait a bit, watch them turn, escape, look if it wrote something nice above 50 
- another try is not installing steam system wide via apt-get, instead, remove it, and install it via download from the steam page
it will install per default into ~/.local/share/Steam for your user only.
should the problem be steam. but does not sound like it. so don’t do this if it sounds complicated, since i hardly imagine that’s the fault. have you tried other steam apps?
- you can put ldd output and glxinfo output here, in spoiler&code tags.
[spoiler] [code] paste output [/ code] [/ spoiler] without spaces in the []-tags.
looks like this
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ask if anything i wrote is unclear.
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don’t panic.