I have the same problem: bibliotheque@bibliotheque:~$ apt-get install flash-plugin-nonfree E: Impossible d'ouvrir le fichier verrou /var/lib/dpkg/lock - open (13 Permission non accordée) E: Unable to lock the administration directory (/var/lib/dpkg/), are you root? bibliotheque@bibliotheque:~$ sudo apt-get install flash-plugin-nonfree [sudo] password for bibliotheque: E: Impossible de verrouiller /var/lib/dpkg/lock - open (11 Ressource temporairement non disponible) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it? bibliotheque@bibliotheque:~$ sudo apt-get install flash-plugin-nonfree E: Impossible de verrouiller /var/lib/dpkg/lock - open (11 Ressource temporairement non disponible) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it? bibliotheque@bibliotheque:~$ sudo apt-get install flash-plugin-nonfree E: Impossible de verrouiller /var/lib/dpkg/lock - open (11 Ressource temporairement non disponible) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it? bibliotheque@bibliotheque:~$ sudo apt-get install flash-plugin-nonfree Lecture des listes de paquets... Fait Construction de l'arbre des dépendances Lecture des informations d'état... Fait E: Impossible de trouver le paquet flash-plugin-nonfree bibliotheque@bibliotheque:~$ sudo apt-get install flashplugin-nonfree Lecture des listes de paquets... Fait Construction de l'arbre des dépendances Lecture des informations d'état... Fait Paquets suggérés : konqueror-nsplugins msttcorefonts ttf-xfree86-nonfree xfs Les NOUVEAUX paquets suivants seront installés : flashplugin-nonfree 0 mis à jour, 1 nouvellement installés, 0 à enlever et 0 non mis à jour. Il est nécessaire de prendre 0o/18,1ko dans les archives. Après dépaquetage, 160ko d'espace disque supplémentaires seront utilisés. Préconfiguration des paquets... Sélection du paquet flashplugin-nonfree précédemment désélectionné. (Lecture de la base de données... 89721 fichiers et répertoires déjà installés.) Dépaquetage de flashplugin-nonfree (à partir de .../flashplugin-nonfree_9.0.48.0.2+really0ubuntu12_i386.deb) ... Paramétrage de flashplugin-nonfree (9.0.48.0.2+really0ubuntu12) ... Downloading... --08:46:43-- http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player_9_linux.tar.gz => `./install_flash_player_9_linux.tar.gz' Résolution de fpdownload.macromedia.com... 88.221.22.70 Connexion vers fpdownload.macromedia.com|88.221.22.70|:80... connecté. requête HTTP transmise, en attente de la réponse... 200 OK Longueur: 3 036 127 (2.9M) [application/x-gzip] 0K .......... .......... .......... .......... .......... 1% 41.25 KB/s 50K .......... .......... .......... .......... .......... 3% 55.40 KB/s 100K .......... .......... .......... .......... .......... 5% 38.99 KB/s 150K .......... .......... .......... .......... .......... 6% 138.54 KB/s 200K .......... .......... .......... .......... .......... 8% 87.68 KB/s 250K .......... .......... .......... .......... .......... 10% 81.28 KB/s 300K .......... .......... .......... .......... .......... 11% 137.80 KB/s 350K .......... .......... .......... .......... .......... 13% 135.52 KB/s 400K .......... .......... .......... .......... .......... 15% 137.51 KB/s 450K .......... .......... .......... .......... .......... 16% 139.18 KB/s 500K .......... .......... .......... .......... .......... 18% 121.70 KB/s 550K .......... .......... .......... .......... .......... 20% 47.55 KB/s 600K .......... .......... .......... .......... .......... 21% 93.28 KB/s 650K .......... .......... .......... .......... .......... 23% 81.68 KB/s 700K .......... .......... .......... .......... .......... 25% 88.89 KB/s 750K .......... .......... .......... .......... .......... 26% 81.15 KB/s 800K .......... .......... .......... .......... .......... 28% 168.33 KB/s 850K .......... .......... .......... .......... .......... 30% 87.39 KB/s 900K .......... .......... .......... .......... .......... 32% 59.85 KB/s 950K .......... .......... .......... .......... .......... 33% 84.77 KB/s 1000K .......... .......... .......... .......... .......... 35% 133.29 KB/s 1050K .......... .......... .......... .......... .......... 37% 135.79 KB/s 1100K .......... .......... .......... .......... .......... 38% 114.95 KB/s 1150K .......... .......... .......... .......... .......... 40% 135.01 KB/s 1200K .......... .......... .......... .......... .......... 42% 132.61 KB/s 1250K .......... .......... .......... .......... .......... 43% 87.83 KB/s 1300K .......... .......... .......... .......... .......... 45% 137.32 KB/s 1350K .......... .......... .......... .......... .......... 47% 137.21 KB/s 1400K .......... .......... .......... .......... .......... 48% 123.84 KB/s 1450K .......... .......... .......... .......... .......... 50% 128.45 KB/s 1500K .......... .......... .......... .......... .......... 52% 80.32 KB/s 1550K .......... .......... .......... .......... .......... 53% 85.54 KB/s 1600K .......... .......... .......... .......... .......... 55% 127.31 KB/s 1650K .......... .......... .......... .......... .......... 57% 148.83 KB/s 1700K .......... .......... .......... .......... .......... 59% 142.03 KB/s 1750K .......... .......... .......... .......... .......... 60% 58.73 KB/s 1800K .......... .......... .......... .......... .......... 62% 48.87 KB/s 1850K .......... .......... .......... .......... .......... 64% 87.98 KB/s 1900K .......... .......... .......... .......... .......... 65% 121.00 KB/s 1950K .......... .......... .......... .......... .......... 67% 64.81 KB/s 2000K .......... .......... .......... .......... .......... 69% 80.25 KB/s 2050K .......... .......... .......... .......... .......... 70% 145.36 KB/s 2100K .......... .......... .......... .......... .......... 72% 141.20 KB/s 2150K .......... .......... .......... .......... .......... 74% 79.71 KB/s 2200K .......... .......... .......... .......... .......... 75% 80.77 KB/s 2250K .......... .......... .......... .......... .......... 77% 125.42 KB/s 2300K .......... .......... .......... .......... .......... 79% 212.23 KB/s 2350K .......... .......... .......... .......... .......... 80% 143.10 KB/s 2400K .......... .......... .......... .......... .......... 82% 161.18 KB/s 2450K .......... .......... .......... .......... .......... 84% 119.27 KB/s 2500K .......... .......... .......... .......... .......... 86% 85.10 KB/s 2550K .......... .......... .......... .......... .......... 87% 119.63 KB/s 2600K .......... .......... .......... .......... .......... 89% 136.48 KB/s 2650K .......... .......... .......... .......... .......... 91% 137.40 KB/s 2700K .......... .......... .......... .......... .......... 92% 139.20 KB/s 2750K .......... .......... .......... .......... .......... 94% 136.05 KB/s 2800K .......... .......... .......... .......... .......... 96% 85.67 KB/s 2850K .......... .......... .......... .......... .......... 97% 114.21 KB/s 2900K .......... .......... .......... .......... .......... 99% 137.05 KB/s 2950K .......... .... 100% 220.76 KB/s 08:47:14 (96.86 KB/s) - « ./install_flash_player_9_linux.tar.gz » sauvegardé [3036127/3036127] Download done. md5sum mismatch install_flash_player_9_linux.tar.gz The Flash plugin is NOT installed.