Hi, just recently this started happening for no apparent reason.
I am running Ubuntu Mate on a Raspberry Pi2. This is the output from terminal:
ross@pi2:~$ chromium-browser
Segmentation fault (core dumped)
ross@pi2:~$ [4066:4066:0324/182725:ERROR:sandbox_linux.cc(334)] InitializeSandbox() called with multiple threads in process gpu-process
I have already tried re-installing chromium-browser and deleting the configuration files for it.
Any ideas, thanks.
I can comfirm that is is doing the same exact thing here with the same message.
I have also tried the same fix (uninstall Chromium-browser, and even removing the chromium browser folder in (homefolder)/.config ā¦ I reinstalled it and same segment fault message as the original poster
Same here I think last update have something wrong. I go back to previous version and it works.
Try updating again, I just did and there was a new version included!. 
Fully updated, get a Sandbox error
[1:1:0327/102628:FATAL:setuid_sandbox_client.cc(126)] Check failed: IsFileSystemAccessDenied().
#0 0x000073d5373a base::debug::StackTrace::StackTrace()
#1 0x000073d665b2 logging::LogMessage::~LogMessage()
#2 0x0000732e32ae sandbox::SetuidSandboxClient::ChrootMe()
#3 0x000075f76f34
#4 0x000075d0eb92
#5 0x000075d0f06c
#6 0x000075d0de76 content::ContentMain()
#7 0x000054d1e51c
#8 0x0000723c3772 __libc_start_main
Received signal 6
#0 0x000073d5373a base::debug::StackTrace::StackTrace()
#1 0x000073d53a2c
#2 0x0000723d2230
#3 0x0000723c39a6
#4 0x0000723d161e gsignal
#5 0x0000723d2312 abort
#6 0x0000723fb3ac _IO_file_xsputn
#7 0x0000733a4c40 gfx::ScaleToCeiledSize()
[end of stack trace]
Okay, try the following, remove Chromium and then change your software sources download location and then re-install it and see if that helps?.
I have tried updating Chromium and it is still not working for me.
Please how can I fix it ?
Here is the output from terminal again:
ross@pi2:~$ chromium-browser
[1766:1766:0328/165027:ERROR:logging.h(813)] Failed to call method: org.freedesktop.DBus.ObjectManager.GetManagedObjects: object_path= /: org.freedesktop.DBus.Error.TimedOut: Failed to activate service āorg.bluezā: timed out
Segmentation fault (core dumped)
ross@pi2:~$ [1813:1813:0328/165030:ERROR:sandbox_linux.cc(334)] InitializeSandbox() called with multiple threads in process gpu-process
Hi,
Chromium browser works fine on my version of UM 16.04!.
I donāt know really what to suggest apart from looking at this old thread which might help you?:
If you have a 64 bit version of Ubuntu Mate, install Google Chrome 64 bit (32 bit is no longer supported!):
Iām using a Pi2. Many other users said they were experiencing the same problem, please can I know how any of you resolved it ?
This problem came out of nowhere. What is the proper procedure to update chromium to latest version or roll back to a previous version or to update Ubuntu Mate on the pi as well ? Thanks
I have the same problem, pi2 and segmentation fault, and I donāt know how can I rollback to a chromium version worked.
Anybody know what was the last version that works?
I have the same issue with ubuntu server minimal for Raspberry Pi 2 (downloaded from https://ubuntu-pi-flavour-maker.org/download/).
To downgrade:
From command line (terminal) you can run
apt-cache policy chromium-browser
Now you can see the versions that are available.
chromium-browser: Installed: 45.0.2454.101-0ubuntu1.1201 Candidate: 49.0.2623.108-0ubuntu0.15.10.1.1223 Version table: 49.0.2623.108-0ubuntu0.15.10.1.1223 0 ... etc etc
At least for me, there are 2 versions available, where the oldest works.
I had to remove the newest with
sudo apt-get remove chromium-browser chromium-codecs-ffmpeg-extra chromium-browser-l10n
and then install the older one with
sudo apt-get install chromium-browser=45.0.2454.101-0ubuntu1.1201 chromium-codecs-ffmpeg-extra=45.0.2454.101-0ubuntu1.1201 chromium-browser-l10n=45.0.2454.101-0ubuntu1.1201
(Edit to add Aworanās instructions to block chromium updates)
Block updates with
sudo apt-mark hold chromium-codecs-ffmpeg-extra chromium-browser chromium-browser-l10n
Last working version is 48 but is not available with apt-get install.
So I think the best to downgrade to last working version is open a terminal then :
sudo apt-get remove chromium-browser chromium-codecs-ffmpeg-extra chromium-browser-l10n
wget https://launchpad.net/~canonical-chromium-builds/+archive/ubuntu/stage/+build/9035280/+files/chromium-browser_48.0.2564.116-0ubuntu0.15.10.1.1221_armhf.deb https://launchpad.net/~canonical-chromium-builds/+archive/ubuntu/stage/+build/9035280/+files/chromium-codecs-ffmpeg-extra_48.0.2564.116-0ubuntu0.15.10.1.1221_armhf.deb http://launchpadlibrarian.net/240471518/chromium-browser-l10n_48.0.2564.116-0ubuntu0.15.10.1.1221_all.deb
sudo dpkg -i chromium-codecs-ffmpeg-extra_48.0.2564.116-0ubuntu0.15.10.1.1221_armhf.deb
sudo dpkg -i chromium-browser_48.0.2564.116-0ubuntu0.15.10.1.1221_armhf.deb
sudo dpkg -i chromium-browser-l10n_48.0.2564.116-0ubuntu0.15.10.1.1221_all.deb
Then you can block updates on chromium packages with :
sudo apt-mark hold chromium-codecs-ffmpeg-extra chromium-browser chromium-browser-l10n
When a new working release will be available you can unblock packages updating with :
sudo apt-mark unhold chromium-codecs-ffmpeg-extra chromium-browser chromium-browser-l10n
sudo apt-get upgrade
Enjoy,
Aworan
i have been battling this for the last few days and it seems that the reason for this happening is the --enable-pinch flag.
if i open an xterm and type in chromium-browser --disable-pinch chrome will launch.
if i then go on to set the flag in chrome://flags/#enable-pinch to disable i can launch chromium from inside the xterm without the switch.
however - when i launch X and try to start it from the command line this happens:-
startx /usr/bin/chromium-browser --kiosk
which launches
/bin/sh /usr/bin/startx /usr/bin/chromium-browser --kiosk
which in turn launches
xinit /usr/bin/chromium-browser --kiosk
which the launches
chromium-browser --enable-pinch --kiosk
and the #$#@!#@$$!@#$!$ --enable-pinch is back!!!
how do you set a chromium-flag for every user?
I'm not sure but maybe users & groups in the Control Centre?, you could also try adding the disable-pinch command to Startup Applications?:
i found what it was
/etc/alternatives/x-www-browser
has a variable want_touch_pinch set to 1 by default. this was triggering the adding of the --enable-pinch
no matter what you set anywhere else, it was being added by this script and over-rides the disable flag
setting it to 0 solved the issue.
perhaps a good question now would be - why is this script even messing with --enable-pinch ?
So when will this issue be resolved ? With whom does the fault lie ?
I guess canonical lauchpad arm build, I will try to report the problem here if it is not already.
It don't work in mate 16.04 beta 2 too 
Aworan
A bug report was already open in launchpad, I added another comment.
https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1563184
Maybe you can create an account to and click āthis bug affect meā to make the counter grow 
I hope they will fiw it soon !
Thanks, Iāll do that !
So I am running rpi2 and install chromium and it crashes. I am running 16.04 beta 2. I did the updates no luck? Any ideas?