unity-2d-shell 5.6.0-0ubuntu1 crashes with symbol lookup error: /usr/lib/libunity-2d-private.so.0: undefined symbol: _ZN5unity4dash16FilesystemLensesC1ERKSs

[Paul Sladen]

ii libunity-2d-private0 5.6.0-0ubuntu1 Unity 2D shared library
ii unity-2d-shell 5.6.0-0ubuntu1 Dash and Launcher for the Unity 2D environment

  $ unity-2d-shell
  …
  unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+S"
  unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+T"
  unity-2d-shell: symbol lookup error: /usr/lib/libunity-2d-private.so.0: undefined symbol: _ZN5unity4dash16FilesystemLensesC1ERKSs

[Paul Sladen (sladen)]

(gdb) break _ZN5unity4dash16FilesystemLensesC1ERKSs
Breakpoint 2 at 0x7ffff5c227c0

Breakpoint 2, 0x00007ffff5c227c0 in unity::dash::FilesystemLenses::FilesystemLenses () from /usr/lib/libunity-2d-private.so.0
(gdb) bt
#0 0x00007ffff5c227c0 in unity::dash::FilesystemLenses::FilesystemLenses () from /usr/lib/libunity-2d-private.so.0
#1 0x00007ffff5c6b975 in Lenses::Lenses (this=0x1822680, parent=<optimized out>)
    at /build/buildd/unity-2d-5.6.0/libunity-2d-private/src/lenses.cpp:42
#2 0x00007fffe44fc530 in QDeclarativeElement (this=0x1822680) at /usr/include/qt4/QtDeclarative/qdeclarativeprivate.h:82
#3 QDeclarativePrivate::createInto<Lenses> (memory=<optimized out>) at /usr/include/qt4/QtDeclarative/qdeclarativeprivate.h:91
#4 0x00007ffff65ed7a8 in QDeclarativeVME::run (this=0x7fffffffdb70, stack=..., ctxt=0xb0fd80, comp=0xaba1f0, start=<optimized out>,
    count=<optimized out>, bindingSkipList=...) at qml/qdeclarativevme.cpp:287
#5 0x00007ffff65efb5b in QDeclarativeVME::run (this=<optimized out>, ctxt=<optimized out>, comp=<optimized out>, start=<optimized out>,
    count=<optimized out>, bindingSkipList=...) at qml/qdeclarativevme.cpp:133
#6 0x00007ffff65e3270 in QDeclarativeComponentPrivate::begin (parentContext=0xb10410, componentCreationContext=0x0, component=0xaba1f0, start=-1,
    count=-1, state=0x851268, errors=0x0, bindings=...) at qml/qdeclarativecomponent.cpp:871
#7 0x00007ffff65e374d in QDeclarativeComponentPrivate::beginCreate (this=0x8511b0, context=0xb10410, bindings=...)
    at qml/qdeclarativecomponent.cpp:836
#8 0x00007ffff65e3831 in QDeclarativeComponent::beginCreate (this=<optimized out>, context=<optimized out>) at qml/qdeclarativecomponent.cpp:798
#9 0x00007ffff6574e8f in QDeclarativeLoaderPrivate::_q_sourceLoaded (this=0x865710) at graphicsitems/qdeclarativeloader.cpp:387
#10 0x00007ffff65e2a23 in QDeclarativeComponentPrivate::complete (enginePriv=0x7f0360, state=0x8427d8) at qml/qdeclarativecomponent.cpp:962
#11 0x00007ffff65e30cf in completeCreate (this=<optimized out>) at qml/qdeclarativecomponent.cpp:1043
#12 QDeclarativeComponentPrivate::completeCreate (this=<optimized out>) at qml/qdeclarativecomponent.cpp:1039
#13 0x00007ffff65e12cf in QDeclarativeComponent::create (this=0x8423b0, context=<optimized out>) at qml/qdeclarativecomponent.cpp:768
#14 0x00007ffff64ca39f in QDeclarativeView::continueExecute (this=0x7fffffffdf60) at util/qdeclarativeview.cpp:552
#15 0x00000000004093f4 in main (argc=1, argv=<optimized out>) at /build/buildd/unity-2d-5.6.0/shell/app/shell.cpp:87

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Gerry Boland (gerboland)]

Performing an update should fix this. Can you confirm please?

[David (kdavid93)]

Could you please fix this problem?
With this bug I can't use any Unity environment.
I can't use Unity because of my VGA and now I can't even use Unity 2D because of this bug.
I had to install LXDE to be able to use my computer.

[Silviu Grijincu (silviu.grijincu)]

There is no unity-2d in my updated packages in the last 24 hours, so updating does not fix this.

[Raphaël Badin (rvb)]

I'm seeing this too.

Unity shell is not there when I log in and launching 'unity-2d-shell' manually triggers the error:
unity-2d-shell: symbol lookup error: /usr/lib/libunity-2d-private.so.0: undefined symbol: _ZN5unity4dash16FilesystemLensesC1ERKSs

I can't use unity 3d because of the awful performance I get from my GeForce 8400M GS. Now it's difficult to use unity-2d.

[Albert Astals Cid (aacid)]

What's the output you get from doing
    dpkg -l | grep -i libunity-core
in a shell?

[Raphaël Badin (rvb)]

$ dpkg -l | grep -i libunity-core
rc libunity-core-4.0-4 4.28.0-0ubuntu2 Core library for the Unity interface.
ii libunity-core-5.0-5 5.6.0-0ubuntu1 Core library for the Unity interface.

[Albert Astals Cid (aacid)]

Something went wrong with the packaging, https://launchpad.net/ubuntu/+archive/primary/+files/unity-2d_5.6.0.orig.tar.gz contains the line
   m_unityLenses = new unity::dash::FilesystemLenses("/usr/share/unity/lenses");
in libunity-2d-private/src/lenses.cpp that was removed in r929
  http://bazaar.launchpad.net/~unity-2d-team/unity-2d/trunk/revision/929
and 5.6.0 is supposed to be r948
  bazaar.launchpad.net/~unity-2d-team/unity-2d/trunk/revision/948
so the tarball should not contain that line of code

[Didier Roche-Tolomelli (didrocks)]

5.6.0 contained the revert of this commit as we released unity-2d 5.6.0-0ubuntu1 built with unity-core 5.4.

Yesterday, once unity-core 5.6 was rebuilt (but without ABI bump :/), I then rebuilt unity-2d 5.6.0-0ubuntu2 with the revert of the revert (btw you can see it in the diff.gz).

I think that the crash occured during the transition, as libunity-core didn't get an ABI break.