barryn@sempron:~$ sudo aptitude install flashplugin-nonfree Reading package lists... Done Building dependency tree Reading state information... Done Reading extended state information Initializing package states... Done Building tag database... Done The following NEW packages will be installed: flashplugin-nonfree 0 packages upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 0B/18.1kB of archives. After unpacking 160kB will be used. Writing extended state information... Done Preconfiguring packages ... Selecting previously deselected package flashplugin-nonfree. (Reading database ... 94405 files and directories currently installed.) Unpacking flashplugin-nonfree (from .../flashplugin-nonfree_9.0.48.0.2+really0ubuntu12_i386.deb) ... Setting up flashplugin-nonfree (9.0.48.0.2+really0ubuntu12) ... Downloading... --09:57:31-- http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player_9_linux.tar.gz => `./install_flash_player_9_linux.tar.gz' Resolving fpdownload.macromedia.com... 72.247.202.70 Connecting to fpdownload.macromedia.com|72.247.202.70|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 3,036,127 (2.9M) [application/x-gzip] 0K .......... .......... .......... .......... .......... 1% 206.29 KB/s 50K .......... .......... .......... .......... .......... 3% 295.44 KB/s 100K .......... .......... .......... .......... .......... 5% 506.92 KB/s 150K .......... .......... .......... .......... .......... 6% 722.15 KB/s 200K .......... .......... .......... .......... .......... 8% 840.76 KB/s 250K .......... .......... .......... .......... .......... 10% 920.43 KB/s 300K .......... .......... .......... .......... .......... 11% 942.62 KB/s 350K .......... .......... .......... .......... .......... 13% 1.04 MB/s 400K .......... .......... .......... .......... .......... 15% 1.11 MB/s 450K .......... .......... .......... .......... .......... 16% 1.91 MB/s 500K .......... .......... .......... .......... .......... 18% 1.02 MB/s 550K .......... .......... .......... .......... .......... 20% 1.54 MB/s 600K .......... .......... .......... .......... .......... 21% 1.16 MB/s 650K .......... .......... .......... .......... .......... 23% 1.09 MB/s 700K .......... .......... .......... .......... .......... 25% 1.66 MB/s 750K .......... .......... .......... .......... .......... 26% 1.06 MB/s 800K .......... .......... .......... .......... .......... 28% 1.57 MB/s 850K .......... .......... .......... .......... .......... 30% 1.15 MB/s 900K .......... .......... .......... .......... .......... 32% 1.14 MB/s 950K .......... .......... .......... .......... .......... 33% 1.24 MB/s 1000K .......... .......... .......... .......... .......... 35% 1.28 MB/s 1050K .......... .......... .......... .......... .......... 37% 1.36 MB/s 1100K .......... .......... .......... .......... .......... 38% 1.04 MB/s 1150K .......... .......... .......... .......... .......... 40% 1.02 MB/s 1200K .......... .......... .......... .......... .......... 42% 1.58 MB/s 1250K .......... .......... .......... .......... .......... 43% 1.47 MB/s 1300K .......... .......... .......... .......... .......... 45% 986.20 KB/s 1350K .......... .......... .......... .......... .......... 47% 1.31 MB/s 1400K .......... .......... .......... .......... .......... 48% 1.43 MB/s 1450K .......... .......... .......... .......... .......... 50% 1.33 MB/s 1500K .......... .......... .......... .......... .......... 52% 1.16 MB/s 1550K .......... .......... .......... .......... .......... 53% 1.38 MB/s 1600K .......... .......... .......... .......... .......... 55% 1.70 MB/s 1650K .......... .......... .......... .......... .......... 57% 1.04 MB/s 1700K .......... .......... .......... .......... .......... 59% 1.01 MB/s 1750K .......... .......... .......... .......... .......... 60% 1.52 MB/s 1800K .......... .......... .......... .......... .......... 62% 1.08 MB/s 1850K .......... .......... .......... .......... .......... 64% 1.13 MB/s 1900K .......... .......... .......... .......... .......... 65% 1.22 MB/s 1950K .......... .......... .......... .......... .......... 67% 1.32 MB/s 2000K .......... .......... .......... .......... .......... 69% 1.01 MB/s 2050K .......... .......... .......... .......... .......... 70% 1.85 MB/s 2100K .......... .......... .......... .......... .......... 72% 1.00 MB/s 2150K .......... .......... .......... .......... .......... 74% 1.03 MB/s 2200K .......... .......... .......... .......... .......... 75% 2.00 MB/s 2250K .......... .......... .......... .......... .......... 77% 1.07 MB/s 2300K .......... .......... .......... .......... .......... 79% 1.64 MB/s 2350K .......... .......... .......... .......... .......... 80% 1.06 MB/s 2400K .......... .......... .......... .......... .......... 82% 1.13 MB/s 2450K .......... .......... .......... .......... .......... 84% 1.41 MB/s 2500K .......... .......... .......... .......... .......... 86% 1.14 MB/s 2550K .......... .......... .......... .......... .......... 87% 1.15 MB/s 2600K .......... .......... .......... .......... .......... 89% 1.59 MB/s 2650K .......... .......... .......... .......... .......... 91% 987.83 KB/s 2700K .......... .......... .......... .......... .......... 92% 1.31 MB/s 2750K .......... .......... .......... .......... .......... 94% 1.23 MB/s 2800K .......... .......... .......... .......... .......... 96% 1.71 MB/s 2850K .......... .......... .......... .......... .......... 97% 1.09 MB/s 2900K .......... .......... .......... .......... .......... 99% 1.94 MB/s 2950K .......... .... 100% 481.33 KB/s 09:57:34 (1.03 MB/s) - `./install_flash_player_9_linux.tar.gz' saved [3036127/3036127] Download done. md5sum mismatch install_flash_player_9_linux.tar.gz The Flash plugin is NOT installed. Reading package lists... Done Building dependency tree Reading state information... Done Reading extended state information Initializing package states... Done Writing extended state information... Done Building tag database... Done barryn@sempron:~$ My first thought, off the top of my head, is that there was recently a new release of the Flash plugin. The flashplugin-nonfree package needs to be updated either (a) to specifically download the older Flash plugin, if that is possible, or (b) for the new Flash release.