Chromium cannot found pepperflash plugin

I've tryed to install chromium-browser-dgb in order to have symbols for gdb but apt says

sudo apt-get install chromium-browser-dbg
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 chromium-browser-dbg : Depends: chromium-browser (= 51.0.2704.79-0ubuntu0.16.04.1.1242) but 59.0.3071.109-0ubuntu0.16.04.1289 is to be installed
E: Unable to correct problems, you have held broken packages.

a work-around is to delete the directory ~/.config/chromium-browser.
Thanks to Francesco Salvestrini who found this solution.

I get the same error every time. Deleted ~/.config/chromium-browser but only helped while i'm not signed in with a google account.

The moment I sign in with an account the browser chrashes.

Output:

Using PPAPI flash.
 --ppapi-flash-path=/usr/lib/adobe-flashplugin/libpepflashplayer.so --ppapi-flash-version=
[13209:13267:0705/093740.936240:ERROR:socket_stream.cc(101)] Socket was disconnected, closing input stream
[13209:13267:0705/093740.936267:ERROR:socket_stream.cc(210)] Closing stream with result -100
Received signal 11 SEGV_MAPERR 000000000010
#0 0x7f44196d3425 base::debug::StackTrace::StackTrace()
#1 0x7f44196d380b <unknown>
#2 0x7f44199fe390 <unknown>
#3 0x56398c8d9dc8 <unknown>
#4 0x56398c8dc656 <unknown>
#5 0x56398c8dcdf9 <unknown>
#6 0x56398c8dd143 <unknown>
#7 0x7f441974e821 <unknown>
#8 0x7f44196d4eea base::debug::TaskAnnotator::RunTask()
#9 0x7f44196fde90 base::MessageLoop::RunTask()
#10 0x7f44196ff97d base::MessageLoop::DeferOrRunPendingTask()
#11 0x7f441970083d <unknown>
#12 0x7f4419701300 base::MessagePumpLibevent::Run()
#13 0x7f44196fcf15 base::MessageLoop::RunHandler()
#14 0x7f4419727628 base::RunLoop::Run()
#15 0x7f4419753e36 base::Thread::ThreadMain()
#16 0x7f441974e726 <unknown>
#17 0x7f44199f46ba start_thread
#18 0x7f44030a33dd clone
  r8: 000000000000002e r9: 000056398e3306ec r10: 0000000000000000 r11: 00007f4403130f50
 r12: 00007f43537fcff0 r13: 0000000000000008 r14: 0000000000000008 r15: 00007f43537fceb0
  di: 0000000000000000 si: 00007f43537fceb0 bp: 00007f43537fcf00 bx: 00007f43537fceb0
  dx: 0000000000000060 ax: 0000000000000000 cx: 00007f43a8009fe0 sp: 00007f43537fce60
  ip: 000056398c8d9dc8 efl: 0000000000010206 cgf: 0000000000000033 erf: 0000000000000004
 trp: 000000000000000e msk: 0000000000000000 cr2: 0000000000000010
[end of stack trace]
Calling _exit(1). Core file will not be generated.

Seems you need to install: browser-plugin-freshplayer-pepperflash from the archive

dino99 comment has worked for me!

It seems browser-plugin-freshplayer-pepperflash fixes the issue.

Thanks!

Sorry, i must retract. I've just restarted the browser and keeps crashing.

Now i even removed PPAPI plugins and a similar error shows. It seems not related:

PPAPI flash has config file in /etc, but library does not exist and won't be used. Package is uninstalled, not purged.
Received signal 11 SEGV_MAPERR 000000000010
#0 0x7f0f6c9ea425 base::debug::StackTrace::StackTrace()
#1 0x7f0f6c9ea80b <unknown>
#2 0x7f0f6cd15390 <unknown>
#3 0x564b50907dc8 <unknown>
#4 0x564b5090a656 <unknown>
#5 0x564b5090adf9 <unknown>
#6 0x564b5090b143 <unknown>
#7 0x7f0f6ca65821 <unknown>
#8 0x7f0f6c9ebeea base::debug::TaskAnnotator::RunTask()
#9 0x7f0f6ca14e90 base::MessageLoop::RunTask()
#10 0x7f0f6ca1697d base::MessageLoop::DeferOrRunPendingTask()
#11 0x7f0f6ca1783d <unknown>
#12 0x7f0f6ca18300 base::MessagePumpLibevent::Run()
#13 0x7f0f6ca13f15 base::MessageLoop::RunHandler()
#14 0x7f0f6ca3e628 base::RunLoop::Run()
#15 0x7f0f6ca6ae36 base::Thread::ThreadMain()
#16 0x7f0f6ca65726 <unknown>
#17 0x7f0f6cd0b6ba start_thread
#18 0x7f0f563ba3dd clone
  r8: 000000000000002e r9: 0000564b5235e6ec r10: 0000000000000000 r11: 00007f0f56447f50
 r12: 00007f0ec57f7ff0 r13: 0000000000000008 r14: 0000000000000008 r15: 00007f0ec57f7eb0
  di: 0000000000000000 si: 00007f0ec57f7eb0 bp: 00007f0ec57f7f00 bx: 00007f0ec57f7eb0
  dx: 0000000000000060 ax: 0000000000000000 cx: 0000564b54e9f7e0 sp: 00007f0ec57f7e60
  ip: 0000564b50907dc8 efl: 0000000000010206 cgf: 0000000000000033 erf: 0000000000000004
 trp: 000000000000000e msk: 0000000000000000 cr2: 0000000000000010
[end of stack trace]
Calling _exit(1). Core file will not be generated.

To everyone affected by the crash: can you please install the debug symbols for chromium-browser (following the instructions at https://wiki.ubuntu.com/Debug%20Symbol%20Packages#Debug_Symbol_Packages) and see if that produces a more complete stacktrace?

Here it goes!

PPAPI flash has config file in /etc, but library does not exist and won't be used. Package is uninstalled, not purged.
# Env:
# LD_LIBRARY_PATH=/usr/lib/chromium-browser
# PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
# GTK_PATH=
# CHROMIUM_USER_FLAGS=
# CHROMIUM_FLAGS= --ppapi-flash-path=/usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so --ppapi-flash-version= --enable-pinch
/usr/bin/gdb /usr/lib/chromium-browser/chromium-browser -x /tmp/chromiumargs.yUPPLg
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/lib/chromium-browser/chromium-browser...Reading symbols from /usr/lib/debug/.build-id/61/aaf938452c2615d0258d7cf35e7005e09b2242.debug...done.
done.
(gdb) handle SIG33 pass nostop noprint
Signal Stop Print Pass to program Description
SIG33 No No Yes Real-time event 33
(gdb) set pagination 0
(gdb) run
Starting program: /usr/lib/chromium-browser/chromium-browser --ppapi-flash-path=/usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so --ppapi-flash-version= --enable-pinch
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffcd1d7700 (LWP 17074)]
[New Thread 0x7fffcc9d6700 (LWP 17080)]
[New Thread 0x7fffc79da700 (LWP 17081)]
[New Thread 0x7fffc71d9700 (LWP 17082)]
[New Thread 0x7fffc69d8700 (LWP 17083)]
[New Thread 0x7fffc4aea700 (LWP 17084)]
[New Thread 0x7fffb3fff700 (LWP 17085)]
[New Thread 0x7fffcc099700 (LWP 17086)]
[New Thread 0x7fffb37fe700 (LWP 17087)]
[New Thread 0x7fffb2ffd700 (LWP 17088)]
[New Thread 0x7fffb27fc700 (LWP 17089)]
[New Thread 0x7fff97fff700 (LWP 17090)]
[New Thread 0x7fff977fe700 (LWP 17091)]
[New Thread 0x7fff96ffd700 (LWP 17092)]
[New Thread 0x7fff967fc700 (LWP 17093)]
[New Thread 0x7fff95ffb700 (LWP 17094)]
[New Thread 0x7fff957fa700 (LWP 17095)]
[New Thread 0x7fff94ff9700 (LWP 17096)]
[New Thread 0x7fff77fff700 (LWP 17097)]
[New Thread 0x7fff777fe700 (LWP 17098)]
[New Thread 0x7fff76ffd700 (LWP 17099)]
[New Thread 0x7fff767fc700 (LWP 17100)]
[New Thread 0x7fff75ffb700 (LWP 17101)]
[New Thread 0x7fff757fa700 (LWP 17102)]
[New Thread 0x7fff74ff9700 (LWP 17103)]
[New Thread 0x7fff57ae1700 (LWP 17104)]
[New Thread 0x7fff53058700 (LWP 17105)]
[New Thread 0x7fff52857700 (LWP 17106)]
[New Thread 0x7fff51e07700 (LWP 17125)]
[New Thread 0x7fff51606700 (LWP 17126)]
[New Thread 0x7fff50b63700 (LWP 17127)]
[New Thread 0x7fff47ffe700 (LWP 17128)]
[New ...

Backtrace:

(gdb) backtrace
#0 0x0000555555cd4dc8 in std::_Rb_tree<std::__cxx11::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> >, std::pair<std::__cxx11::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> > const, std::unique_ptr<base::DictionaryValue, std::default_delete<base::DictionaryValue> > >, std::_Select1st<std::pair<std::__cxx11::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> > const, std::unique_ptr<base::DictionaryValue, std::default_delete<base::DictionaryValue> > > >, std::less<std::__cxx11::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> > >, std::allocator<std::pair<std::__cxx11::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> > const, std::unique_ptr<base::DictionaryValue, std::default_delete<base::DictionaryValue> > > > >::find () at /usr/include/c++/5/bits/stl_tree.h:2292
#1 0x0000555555cd7656 in std::map<std::__cxx11::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> >, std::unique_ptr<base::DictionaryValue, std::default_delete<base::DictionaryValue> >, std::less<std::__cxx11::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> > >, std::allocator<std::pair<std::__cxx11::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> > const, std::unique_ptr<base::DictionaryValue, std::default_delete<base::DictionaryValue> > > > >::find () at /usr/include/c++/5/bits/stl_map.h:846
#2 extensions::NetworkingPrivateLinux::AddOrUpdateAccessPoint () at ../../extensions/browser/api/networking_private/networking_private_linux.cc:941
#3 0x0000555555cd7df9 in extensions::NetworkingPrivateLinux::AddAccessPointsFromDevice () at ../../extensions/browser/api/networking_private/networking_private_linux.cc:920
#4 0x0000555555cd8143 in extensions::NetworkingPrivateLinux::GetAllWiFiAccessPoints () at ../../extensions/browser/api/networking_private/networking_private_linux.cc:733
#5 0x00007ffff791b821 in base::Callback<void (), (base::internal::CopyMode)0, (base::internal::RepeatMode)0>::Run() && () at ../../base/callback.h:91
#6 RunTaskAndPostReply () at ../../base/threading/post_task_and_reply_impl.cc:45
#7 0x00007ffff78a1eea in base::Callback<void (), (base::internal::CopyMode)0, (base::internal::RepeatMode)0>::Run() && () at ../../base/callback.h:91
#8 base::debug::TaskAnnotator::RunTask () at ../../base/debug/task_annotator.cc:59
#9 0x00007ffff78cae90 in base::MessageLoop::RunTask () at ../../base/message_loop/message_loop.cc:423
#10 0x00007ffff78cc97d in base::MessageLoop::DeferOrRunPendingTask () at ../../base/message_loop/message_loop.cc:434
#11 0x00007ffff78cd83d in base::MessageLoop::DoWork () at ../../base/message_loop/message_loop.cc:527
#12 0x00007ffff78ce300 in base::MessagePumpLibevent::Run () at ../../base/message_loop/message_pump_libevent.cc:219
#13 0x00007ffff78c9f15 in base::MessageLoop::RunHandler () at ../../base/message_loop/message_loop.cc:387
#14 0x00007ffff78f4628 in base::RunLoop::Run () at ../../base/run_loop.cc:...

An other comment:

the 'backport' packages archive often introduce hidden conflicts ('Software & Updates' -> Updates -> Unsupported Updates)

Thats why i never activate that repo.

If yours is activated, then test without it (deactivate -> update -> downgrade -> close/open session)