firefox builddeps are broken

[Karl-Philipp Richter]

`apt-get build-dep firefox` fails due to

    The following packages have unmet dependencies:
     builddeps:firefox : Depends: cargo (>= 0.20) but it is not going to be installed
                         Depends: rustc (>= 1.19.0) but it is not going to be installed
    E: Unable to correct problems, you have held broken packages.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: firefox 57.0.1+build2-0ubuntu0.17.10.1
ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13
Uname: Linux 4.13.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
AddonCompatCheckDisabled: False
ApportVersion: 2.20.7-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
 BEN. PID ZUGR. BEFEHL
 /dev/snd/pcmC0D0p: richter 21932 F...m pulseaudio
 /dev/snd/controlC0: richter 21932 F.... pulseaudio
BuildID: 20171129230227
Channel: Unavailable
CurrentDesktop: Unity:Unity7:ubuntu
Date: Sun Dec 24 00:24:26 2017
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePlugins: Shockwave Flash - /usr/lib/gnash/libgnashplugin.so (browser-plugin-gnash)
DefaultProfilePrefSources:
 /usr/lib/firefox/defaults/pref/all-ubuntumate.js
 prefs.js
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
InstallationDate: Installed on 2015-12-12 (742 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
IpRoute:
 default via 192.168.178.1 dev wlp3s0 proto static metric 600
 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
 192.168.178.0/24 dev wlp3s0 proto kernel scope link src 192.168.178.20 metric 600
MostRecentCrashID: bp-5b310e4c-0eb8-4386-97a8-1176f2160817
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
Profile1Extensions: extensions.sqlite corrupt or missing
Profile1IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
Profile1Locales: extensions.sqlite corrupt or missing
Profile1Plugins: Shockwave Flash - /usr/lib/gnash/libgnashplugin.so (browser-plugin-gnash)
Profile1PrefSources:
 /usr/lib/firefox/defaults/pref/all-ubuntumate.js
 prefs.js
Profile1Themes: extensions.sqlite corrupt or missing
Profile2IncompatibleExtensions:
 English (South Africa) Language Pack - <email address hidden>
 English (GB) Language Pack - <email address hidden>
 Deutsch (DE) Language Pack - <email address hidden>
 Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
Profile2Plugins:
 VLC Web Plugin - /usr/lib/mozilla/plugins/libvlcplugin.so
 Shockwave Flash - /usr/lib/gnash/libgnashplugin.so (browser-plugin-gnash)
 Gnome Shell Integration - /usr/lib/mozilla/plugins/libgnome-shell-browser-plugin.so (gnome-shell)
 IcedTea-Web Plugin (using IcedTea-Web 1.6.2 (1.6.2-3ubuntu1)) - /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so (icedtea-8-plugin)
 Skype Buttons for Kopete - /afs/richtercloud.de/home/.mozilla/plugins/skypebuttons.so
Profile2PrefSources:
 /usr/lib/firefox/defaults/pref/all-ubuntumate.js
 prefs.js
Profile3Extensions: extensions.sqlite corrupt or missing
Profile3IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
Profile3Locales: extensions.sqlite corrupt or missing
Profile3Plugins: Shockwave Flash - /usr/lib/gnash/libgnashplugin.so (browser-plugin-gnash)
Profile3PrefSources:
 /usr/lib/firefox/defaults/pref/all-ubuntumate.js
 prefs.js
Profile3Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile0 (Default) - LastVersion=57.0.1/20171129230227 (In use)
 Profile1 - LastVersion=55.0.2/20170816204344 (Out of date)
 Profile2 - LastVersion=46.0.1/20160511223818 (Out of date)
 Profile3 - LastVersion=55.0.2/20170816204344 (Out of date)
RelatedPackageVersions:
 browser-plugin-gnash 0.8.11~git20160608-1.3
 gnome-shell 3.26.2-0ubuntu0.1
 icedtea-8-plugin 1.6.2-3.1ubuntu3
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: Upgraded to artful on 2017-10-19 (65 days ago)
dmi.bios.date: 07/12/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 71CN51WW(V1.21)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 31900003WIN8 STD MLT
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad Z500 Touch
dmi.modalias: dmi:bvnLENOVO:bvr71CN51WW(V1.21):bd07/12/2013:svnLENOVO:pn20221:pvrLenovoIdeaPadZ500Touch:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadZ500Touch:
dmi.product.family: IDEAPAD
dmi.product.name: 20221
dmi.product.version: Lenovo IdeaPad Z500 Touch
dmi.sys.vendor: LENOVO

[Hans Joachim Desserud (hjd)]

Thanks for reporting.

Looks like the underlying issue here is that the rust and cargo packages haven't been upgraded in older Ubuntu releases, so I'm marking this as a duplicate of bug 1701556.