[kde] [Bug 389801] Discover,kmserver-logout-greeter,look and feel and display related others crash whenever started

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=389801

--- Comment #1 from roshanmaind3434 at gmail.com ---
Created attachment 110317
  --> https://bugs.kde.org/attachment.cgi?id=110317&action=edit
New crash information added by DrKonqi

plasma-discover (5.10.5) using Qt 5.9.1

- What I was doing when the application crashed:

Well, no applications were running but I can mention the suspicious things that
I did before I tried opening Discover:-
1. I changed the sources.list file entries. I removed the country codes from
all the exisiting entries to make them reflect to the main server and I added 4
lines for mirror in the beginning of the file:-
deb mirror://mirrors.ubuntu.com/mirrors.txt precise main restricted universe
multiverse
deb mirror://mirrors.ubuntu.com/mirrors.txt precise-updates main restricted
universe multiverse
deb mirror://mirrors.ubuntu.com/mirrors.txt precise-backports main restricted
universe multiverse
deb mirror://mirrors.ubuntu.com/mirrors.txt precise-security main restricted
universe multiverse

2. I changed my display driver to Nvidia driver from the default xorg one.

3. I changed the theme to Breeze Dark (I know it's stupid to write this as a
suspicous thing, but whatever...)

Also, one unusual thing that happens that I don't think is related to this, but
just in case it is:
When I run "sudo apt-get update", at the end of everything I get a few errors-
W: GPG error: mirror://mirrors.ubuntu.com/mirrors.txt precise-updates
InRelease: The following signatures couldn't be verified because the public key
is not available: NO_PUBKEY 40976EAF437D05B5
E: The repository 'mirror://mirrors.ubuntu.com/mirrors.txt precise-updates
InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration
details.
W: GPG error: mirror://mirrors.ubuntu.com/mirrors.txt precise-backports
InRelease: The following signatures couldn't be verified because the public key
is not available: NO_PUBKEY 40976EAF437D05B5
E: The repository 'mirror://mirrors.ubuntu.com/mirrors.txt precise-backports
InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration
details.
W: GPG error: mirror://mirrors.ubuntu.com/mirrors.txt precise-security
InRelease: The following signatures couldn't be verified because the public key
is not available: NO_PUBKEY 40976EAF437D05B5
E: The repository 'mirror://mirrors.ubuntu.com/mirrors.txt precise-security
InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration
details.
W: GPG error: mirror://mirrors.ubuntu.com/mirrors.txt precise Release: The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY 40976EAF437D05B5
E: The repository 'mirror://mirrors.ubuntu.com/mirrors.txt precise Release' is
not signed.
N: Updating from such a repository can't be done securely, and is therefore
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration
details.

-- Backtrace (Reduced):
#6  __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#7  0x00007efde366af5d in __GI_abort () at abort.c:90
#8  0x00007efde3e2f107 in QMessageLogger::fatal(char const*, ...) const () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007efde732c787 in
QSGRenderLoop::handleContextCreationFailure(QQuickWindow*, bool) () from
/usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
[...]
#12 0x00007efde4e70d35 in QWindow::event(QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5

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