I've just tested this with the 11.10 beta 2 64bit LiveCD. Firefox recognised a .deb file as a Debian package and asked if I wanted to open it with the Ubuntu Software Center.
Package: firefox 7.0~b6+build1+nobinonly-0ubuntu1 Please update and test again. ** Changed in: firefox (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/830911 Title: Firefox by default doesn't know what to do with .deb files Status in “firefox” package in Ubuntu: Incomplete Bug description: In what seems to be a rather annoying regression, Firefox doesn't know that it should be opening .debs with USC. Installed alpha3 and did latest updates. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: firefox 7.0~b1+build1+nobinonly-0ubuntu1 ProcVersionSignature: Ubuntu 3.0.0-9.12-generic 3.0.3 Uname: Linux 3.0.0-9-generic x86_64 AddonCompatCheckDisabled: False AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: vadi 1483 F.... pulseaudio BuildID: 20110819161726 CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xf8400000 irq 49' Mixer name : 'Realtek ALC268' Components : 'HDA:10ec0268,14c00025,00100003 HDA:10573055,10573055,00100700' Controls : 15 Simple ctrls : 12 Channel: beta Date: Mon Aug 22 18:32:39 2011 ForcedLayersAccel: False IfupdownConfig: auto lo iface lo inet loopback InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1) IpRoute: default via 192.168.43.1 dev wlan0 proto static 169.254.0.0/16 dev wlan0 scope link metric 1000 192.168.43.0/24 dev wlan0 proto kernel scope link src 192.168.43.161 ProcEnviron: LANGUAGE=en_AU:en PATH=(custom, no user) LANG=en_AU.UTF-8 SHELL=/bin/bash Profile0Plugins: VLC Multimedia Plugin (compatible Totem 3.0.1) - Lib=libtotem-cone-plugin.so, Location=/usr/lib/mozilla/plugins (totem-mozilla) QuickTime Plug-in 7.6.6 - Lib=libtotem-narrowspace-plugin.so, Location=/usr/lib/mozilla/plugins (totem-mozilla) DivX® Web Player - Lib=libtotem-mully-plugin.so, Location=/usr/lib/mozilla/plugins (totem-mozilla) Windows Media Player Plug-in 10 (compatible; Totem) - Lib=libtotem-gmp-plugin.so, Location=/usr/lib/mozilla/plugins (totem-mozilla) Profiles: Profile0 - LastVersion=7.0/20110819161726 (Running) RelatedPackageVersions: totem-mozilla 3.0.1-0ubuntu4 RunningIncompatibleAddons: False SourcePackage: firefox UpgradeStatus: Upgraded to oneiric on 2011-08-16 (6 days ago) dmi.bios.date: 09/27/2007 dmi.bios.vendor: COMPAL dmi.bios.version: 1.13 dmi.board.name: IFL90 dmi.board.vendor: - dmi.board.version: IFT00 dmi.chassis.asset.tag: - dmi.chassis.type: 10 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.modalias: dmi:bvnCOMPAL:bvr1.13:bd09/27/2007:svn-:pnN/A:pvrN/A:rvn-:rnIFL90:rvrIFT00:cvnNoEnclosure:ct10:cvrN/A: dmi.product.name: N/A dmi.product.version: N/A dmi.sys.vendor: - To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/830911/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp