Ubuntu 18.04 LTS случайным образом замораживается

Я недавно установил Ubuntu 18.04 LTS на моем компьютере вместе с Windows 10. Проблема состоит в том, что, в то время как я брожу по сети или делаю что-то еще, система замораживается, и я должен вызвать завершение работы и перезагрузку. Это происходит случайным образом, обычно берет о получасе.

Мои спецификации оборудования следующие: - Intel Core i3 3240 - NVIDIA GeForce GT 660 я не помню материнскую плату или модели RAM, но если они полезны, я могу попытаться искать их. У меня есть 8 ГБ RAM.

Это - файл журналов от последнего катастрофического отказа:

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

Заранее большое спасибо. Я попытаюсь предоставить любую необходимую дополнительную информацию.