Erro na instalação do Steam no ubuntu 15.04 64bits

[Roqueiro]

Olá pessoal, resolvi abrir esse tópico pois ao instalar o ubuntu 15.04 depois instalei a steam e não consigo iniciar o mesmo o que faço?
O erro que está dando é o seguinte:


Running Steam on ubuntu 15.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(0)
libGL error: unable to load driver: r600_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: r600
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast

[Roqueiro]

Atualisei o driver da AMD e mel ou um pouco mais continua com erro o que devo fazer?

[Roqueiro]

da esse erro aqui o que devo fazer.
Running Steam on ubuntu 15.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1431729692)
Installing breakpad exception handler for appid(steam)/version(1431729692)
Installing breakpad exception handler for appid(steam)/version(1431729692)
Installing breakpad exception handler for appid(steam)/version(1431729692)
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element
Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 78: saw unknown, expected number
Fontconfig warning: "/etc/fonts/conf.d/70-fonts-bpg-georgian.conf", line 12: bad alias
Fontconfig warning: "/etc/fonts/conf.d/70-fonts-bpg-georgian.conf", line 21: bad alias
Fontconfig warning: "/etc/fonts/conf.d/70-fonts-bpg-georgian.conf", line 30: bad alias
[0521/053916:ERROR:browser_main_loop.cc(170)] Running without the SUID sandbox! See https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment for more information on developing with the sandbox on.
Steam: An X Error occurred
X Error of failed request:  BadRequest (invalid request code or no such operation)
Major opcode of failed request:  154
Serial number of failed request:  40
xerror_handler: X failed, continuing
Steam: An X Error occurred
X Error of failed request:  BadRequest (invalid request code or no such operation)
Major opcode of failed request:  154
Serial number of failed request:  41
xerror_handler: X failed, continuing
Steam: An X Error occurred
X Error of failed request:  BadRequest (invalid request code or no such operation)
Major opcode of failed request:  154
Serial number of failed request:  42
xerror_handler: X failed, continuing
glXChooseVisual failedAssert( Assertion Failed: Fatal Error: glXChooseVisual failed ):/home/buildbot/buildslave_steam/steam_rel_client_ubuntu12_linux/build/src/steamUI/Main.cpp:287

Installing breakpad exception handler for appid(steam)/version(1431729692)
Installing breakpad exception handler for appid(steamwebhelper)/version(20150514174016)
Installing breakpad exception handler for appid(steamwebhelper)/version(1431625216)
[0521/053916:ERROR:nss_util.cc(981)] Failed to load NSS libraries.
Installing breakpad exception handler for appid(steamwebhelper)/version(20150514174016)
Installing breakpad exception handler for appid(steamwebhelper)/version(1431729692)
Installing breakpad exception handler for appid(steamwebhelper)/version(1431729692)
assert_20150521053916_6.dmp[4302]: Uploading dump (out-of-process)
/tmp/dumps/assert_20150521053916_6.dmp
assert_20150521053916_6.dmp[4302]: Finished uploading minidump (out-of-process): success = yes
assert_20150521053916_6.dmp[4302]: response: CrashID=bp-86bfb29b-b490-461e-9459-8c10b2150521
assert_20150521053916_6.dmp[4302]: file ''/tmp/dumps/assert_20150521053916_6.dmp'', upload yes: ''CrashID=bp-86bfb29b-b490-461e-9459-8c10b2150521''

[coldrainbr]

Você esta com os drivers open source ou proprietário instalado?
Se for open, melhor trocar pelo do proprietário.

Segue tópico para resolver algum problema que obtiver na instalação do driver prop AMD, http://ubuntuforum-br.org/index.php/topic,116600.0.html