Problema com aplicativos gráficos

[avvsilva]

Olá pessoal,

  Acabei de me inscrever no fórum, sou iniciante no Ubuntu e em Linux em geral. Realizei a instalação de alguns aplicativos a partir do "Central de Programas do Ubuntu", mas não estou conseguindo executar aqueles que exibem gráficos, como o Stellarium e o Celestia. Por exemplo, ao executar o Stellarium a partir do terminal, estou recebendo essas mensagens:

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Using default graphics system specified at build time:  raster
QProcess: Destroyed while process is still running.
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[ This is Stellarium 0.10.5 - http://www.stellarium.org ]
[ Copyright (C) 2000-2010 Fabien Chereau et al          ]
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Writing log file to: "/home/alexandre/.stellarium/log.txt"
File search paths:
  0 .  "/home/alexandre/.stellarium"
  1 .  "/usr/share/stellarium"
Config file is:  "/home/alexandre/.stellarium/config.ini"
Qt GL paint engine is:  "OpenGL"
Cache directory is:  "/home/alexandre/.cache/stellarium/stellarium"
Sky language is  "pt_BR"
Application language is  "pt_BR"
Loading Solar System data ...
Loaded 38 / 38 planet orbits
Loading star data ...
"Loading "/usr/share/stellarium/stars/default/stars_0_0v0_1.cat": 0_0v0_1; 5013"
"Loading "/usr/share/stellarium/stars/default/stars_1_0v0_1.cat": 1_0v0_1; 21999"
"Loading "/usr/share/stellarium/stars/default/stars_2_0v0_1.cat": 2_0v0_1; 151416"
"Loading "/usr/share/stellarium/stars/default/stars_3_1v0_0.cat": 3_1v0_0; 434064"
Finished loading star catalogue data, max_geodesic_level:  3
navigation/preset_sky_time is a double - treating as jday: 2.45151e+06
Loaded 10051 NGC records
Loading NGC name data ...
Loaded 222 / 222 NGC name records successfully
Loaded 88 / 88 constellation records successfully for culture "western"
Loaded 85 / 85 constellation art records successfully for culture "western"
Loaded 89 / 89 constellation names
Loading constellation boundary data ... 
Loaded 782 constellation boundary segments
Loading star names from "/usr/share/stellarium/skycultures/western/star_names.fab"
Loaded 230 / 230 common star names
Loading star names from "/usr/share/stellarium/stars/default/name.fab"
Loaded 3215 / 4359 scientific star names
Creating GUI ...
Falha de segmentação

  Por favor, alguém tem alguma sugestão? Obrigado.