Bonjour,
J’ai une ubuntu 14.04 LTS sur un ordi de bureau.
Pour la petite histoire, j’avais windows 8, j’ai essayé de passer à 10 mais sans succès ! L’install de la Ubuntu c’est faite comme une fleur 
Faut dire que j’étais habitué à plus compliqué… j’ai démarré avec une madrakesoft ds les années 99. (ça c’est pour les dinosaures du forum)
Alors ma Ubuntu c’est le top, les enfants s’éclatent sur Minecraft à part un pb que je n’arrive pas à résoudre.
Après une mise en veille, plus de réseau !
Je suis connecté en RJ45, avec une freebox revolution derrière.
J’ai essayé sans succès :
$ service network-manager restart
start: Tâche inconnue : network-manager
$ sudo ifdown eth0
$ sudo ifup eth0
et dernièrement :
$ sudo dhclient eth0
sudo dhcpcd eth0
sans plus de succès.
Alors je viens de regarder le /var/log/syslog et voici ce que ca donne :
A 10h02 du reseau, à 10h12 plus !
merci de votre aide !
Dec 9 09:17:01 fressil-Dell-DXP061 CRON[3382]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Dec 9 10:02:06 fressil-Dell-DXP061 NetworkManager[807]: sleep requested (sleeping: no enabled: yes)
Dec 9 10:02:06 fressil-Dell-DXP061 NetworkManager[807]: sleeping or disabling…
Dec 9 10:02:06 fressil-Dell-DXP061 NetworkManager[807]: (eth0): device state change: activated -> unmanaged (reason ‘sleeping’) [100 10 37]
Dec 9 10:02:06 fressil-Dell-DXP061 NetworkManager[807]: (eth0): deactivating device (reason ‘sleeping’) [37]
Dec 9 10:02:07 fressil-Dell-DXP061 NetworkManager[807]: (eth0): canceled DHCP transaction, DHCP client pid 1138
Dec 9 10:02:07 fressil-Dell-DXP061 NetworkManager[807]: Writing DNS information to /sbin/resolvconf
Dec 9 10:02:07 fressil-Dell-DXP061 dnsmasq[1434]: configuration des serveurs amonts à partir de DBus
Dec 9 10:02:07 fressil-Dell-DXP061 dnsmasq[1434]: utilise le serveur de nom 2a01:e00::1#53
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Withdrawing address record for 2a01:e35:2f32:1080:a910:1ef3:600:4eb6 on eth0.
Dec 9 10:02:07 fressil-Dell-DXP061 NetworkManager[807]: DNS: plugin dnsmasq update failed
Dec 9 10:02:07 fressil-Dell-DXP061 NetworkManager[807]: Removing DNS information from /sbin/resolvconf
Dec 9 10:02:07 fressil-Dell-DXP061 dnsmasq[1434]: configuration des serveurs amonts à partir de DBus
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Withdrawing address record for 2a01:e35:2f32:1080:219:d1ff:fe75:5b83 on eth0.
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Leaving mDNS multicast group on interface eth0.IPv6 with address 2a01:e35:2f32:1080:219:d1ff:fe75:5b83.
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::219:d1ff:fe75:5b83.
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Registering new address record for fe80::219:d1ff:fe75:5b83 on eth0.*.
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Withdrawing address record for fe80::219:d1ff:fe75:5b83 on eth0.
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::219:d1ff:fe75:5b83.
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Interface eth0.IPv6 no longer relevant for mDNS.
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Withdrawing address record for 192.168.0.15 on eth0.
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.0.15.
Dec 9 10:02:07 fressil-Dell-DXP061 avahi-daemon[761]: Interface eth0.IPv4 no longer relevant for mDNS.
Dec 9 10:02:07 fressil-Dell-DXP061 NetworkManager[807]: (eth0): cleaning up…
Dec 9 10:02:07 fressil-Dell-DXP061 NetworkManager[807]: (eth0): taking down device.
Dec 9 10:02:07 fressil-Dell-DXP061 NetworkManager[807]: NetworkManager state is now ASLEEP
Dec 9 10:02:07 fressil-Dell-DXP061 whoopsie[1069]: offline
Dec 9 10:02:08 fressil-Dell-DXP061 dbus[662]: [system] Activating service name=‘org.freedesktop.nm_dispatcher’ (using servicehelper)
Dec 9 10:02:08 fressil-Dell-DXP061 dbus[662]: [system] Activating service name=‘org.freedesktop.systemd1’ (using servicehelper)
Dec 9 10:02:09 fressil-Dell-DXP061 dbus[662]: [system] Successfully activated service 'org.freedesktop.systemd1’
Dec 9 10:02:09 fressil-Dell-DXP061 dbus[662]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher’
Dec 9 10:02:10 fressil-Dell-DXP061 anacron[4022]: Anacron 2.3 started on 2015-12-09
Dec 9 10:02:10 fressil-Dell-DXP061 anacron[4022]: Normal exit (0 jobs run)
Dec 9 10:02:12 fressil-Dell-DXP061 kernel: [ 5288.988763] PM: Syncing filesystems … done.
Dec 9 10:02:12 fressil-Dell-DXP061 kernel: [ 5289.113252] PM: Preparing system for mem sleep
Dec 9 10:12:09 fressil-Dell-DXP061 rtkit-daemon[1259]: The canary thread is apparently starving. Taking action.
Dec 9 10:12:09 fressil-Dell-DXP061 rtkit-daemon[1259]: Demoting known real-time threads.
Dec 9 10:12:09 fressil-Dell-DXP061 rtkit-daemon[1259]: Successfully demoted thread 2112 of process 2044 (n/a).