Ubuntu 18.04 LTS se congela aleatoriamente

Recientemente instalé Ubuntu 18.04 LTS en mi computadora junto con Windows 10. El problema es que mientras navego por la web o hago otra cosa, el sistema se congela y tengo que forzar el apagado y el reinicio. Esto sucede al azar, por lo general toma alrededor de media hora.

Mis especificaciones de hardware son las siguientes: -Intel Core i3-3240 -nVidia GeForce GTX 660 No recuerdo los modelos de placa base o RAM, pero si son útiles, puedo intentar buscarlos. Tengo 8 GB de RAM.

Este es el archivo de registros del último bloqueo:

16:21:29 kernel: sysrq: SysRq : Emergency Remount R/O
16:21:17 kernel: nouveau 0000:01:00.0: systemd-logind[745]: channel 12 killed!
16:20:36 nautilus: gtk_revealer_set_reveal_child: assertion 'GTK_IS_REVEALER (revealer)' failed
16:20:34 systemd: Started Hostname Service.
16:20:34 dbus-daemon: [system] Successfully activated service 'org.freedesktop.hostname1'
16:20:34 systemd: Starting Hostname Service...
16:20:34 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.133' (uid=1000 pid=4407 comm="/usr/bin/nautilus --gapplication-service " label="unconfined")
16:20:30 nautilus: gtk_revealer_set_reveal_child: assertion 'GTK_IS_REVEALER (revealer)' failed
16:20:00 systemd: Started Hostname Service.
16:20:00 dbus-daemon: [system] Successfully activated service 'org.freedesktop.hostname1'
16:20:00 systemd: Starting Hostname Service...
16:20:00 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.133' (uid=1000 pid=4407 comm="/usr/bin/nautilus --gapplication-service " label="unconfined")
16:19:44 nautilus: gtk_revealer_set_reveal_child: assertion 'GTK_IS_REVEALER (revealer)' failed
16:19:38 zeitgeist-daemo: [31m[15:19:38.843242 WARNING][0m zeitgeist-daemon.vala:127: Unable to parse version info!
16:19:38 systemd: Started Zeitgeist full-text search indexer.
16:19:38 dbus-daemon: [session uid=1000 pid=1369] Successfully activated service 'org.gnome.zeitgeist.SimpleIndexer'
16:19:38 systemd: Starting Zeitgeist full-text search indexer...
16:19:38 zeitgeist-daemo: [31m[15:19:38.689000 WARNING][0m zeitgeist-daemon.vala:334: Failed to execute child process “zeitgeist-datahub” (No such file or directory)
16:19:38 dbus-daemon: [session uid=1000 pid=1369] Successfully activated service 'org.gnome.zeitgeist.Engine'
16:19:38 systemd: Starting Zeitgeist activity log service...
16:19:38 dbus-daemon: [session uid=1000 pid=1369] Activating via systemd: service name='org.gnome.zeitgeist.Engine' unit='zeitgeist.service' requested by ':1.100' (uid=1000 pid=4407 comm="/usr/bin/nautilus --gapplication-service " label="unconfined")
16:18:46 systemd: Started Hostname Service.
16:18:46 dbus-daemon: [system] Successfully activated service 'org.freedesktop.hostname1'
16:18:46 systemd: Starting Hostname Service...
16:18:46 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.133' (uid=1000 pid=4407 comm="/usr/bin/nautilus --gapplication-service " label="unconfined")
16:17:01 cron: pam_unix(cron:session): session closed for user root
16:16:31 systemd: Started Hostname Service.
16:16:31 dbus-daemon: [system] Successfully activated service 'org.freedesktop.hostname1'
16:16:31 nautilus: Called "net usershare info" but it failed: Failed to execute child process “net” (No such file or directory)
16:16:31 systemd: Starting Hostname Service...
16:16:31 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.133' (uid=1000 pid=4407 comm="/usr/bin/nautilus --gapplication-service " label="unconfined")
16:15:07 gnome-shell: (/usr/lib/firefox/firefox:4139): dconf-WARNING **: 16:15:07.532: Unable to open /var/lib/snapd/desktop/dconf/profile/user: Permission denied
16:14:53 systemd: Started Hostname Service.
16:14:53 dbus-daemon: [system] Successfully activated service 'org.freedesktop.hostname1'
16:14:53 nautilus: Called "net usershare info" but it failed: Failed to execute child process “net” (No such file or directory)
16:14:53 systemd: Starting Hostname Service...
16:14:52 dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.131' (uid=1000 pid=4247 comm="/usr/bin/nautilus --gapplication-service " label="unconfined")
16:14:40 thunderbird: 1543936480446 addons.update-checker   WARN    Update manifest for messagingmenu@mozilla.com did not contain an updates property
16:10:36 gnome-shell: [Parent 1799, Gecko_IOThread] WARNING: pipe error (186): Connection reset by peer: file /build/firefox-JcIUVH/firefox-63.0.3+build1/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 356
16:08:12 firefox: Attempting to read the recently used resources file at '/home/ivangouba/.local/share/recently-used.xbel', but the parser failed: Failed to open file “/home/ivangouba/.local/share/recently-used.xbel”: Permission denied.
16:08:01 wpa_supplicant: wlp5s0: CTRL-EVENT-SIGNAL-CHANGE above=1 signal=-60 noise=-95 txrate=115600
16:04:13 sudo: pam_unix(sudo:session): session closed for user root
16:02:45 gnome-shell: (/usr/lib/firefox/firefox:1992): dconf-WARNING **: 16:02:45.089: Unable to open /var/lib/snapd/desktop/dconf/profile/user: Permission denied
16:00:37 kernel: Normal exit (0 jobs run)
16:00:37 kernel: Anacron 2.3 started on 2018-12-04
16:00:37 systemd: Started Run anacron jobs.
15:53:46 gnome-shell: [Child 2392, MediaPlayback #3] WARNING: Decoder=7fb0007b8e20 Decode error: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) - RefPtr<mozilla::MozPromise<RefPtr<mozilla::MediaTrackDemuxer::SamplesHolder>, mozilla::MediaResult, true> > mozilla::MediaSourceTrackDemuxer::DoGetSamples(int32_t): manager is detached.: file /build/firefox-JcIUVH/firefox-63.0.3+build1/dom/media/MediaDecoderStateMachine.cpp, line 3429
15:52:12 sudo: pam_unix(sudo:session): session opened for user root by (uid=0)
15:50:49 systemd-resolve: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
15:50:35 sudo: pam_unix(sudo:session): session opened for user root by (uid=0)
15:49:27 whoopsie: [15:49:27] online

Muchas gracias por adelantado. Intentaré proporcionar cualquier información adicional necesaria.

He resuelto el problema. Aparentemente, mi tarjeta gráfica (Nvidia GeForce GTX 660) no funciona bien con los controladores predeterminados, así que instalé los controladores propietarios de Nvidia y no he tenido un solo bloqueo desde entonces. Para hacerlo, abrí una terminal y ejecuté los siguientes comandos:

1. Primero, agregué el repositorio de controladores de Nvidia:

sudo add-apt-repository ppa: controladores de gráficos / ppa

2. Luego, actualicé los repositorios e instalé el controlador:

sudo apt update

sudo apt install nvidia-387

El 387 después de nvidia es la versión del controlador, que debe sustituir por cualquier versión actual en el momento en que instala sus controladores. Si no sabe qué versión usar, supongo que puede usar 387, que puede ser algo antiguo, pero funciona.

Soy nuevo en Ubuntu, así que siéntete libre de decirme si he dicho algo mal.