Client crashes on Ubuntu 19.04

I’m running the nextcloud client V 2.5.1-2 (from the ubuntu repository) on the latest Ubuntu desktop (19.04) and it crashes with one of the following errors
nextcloud: …/nouveau/pushbuf.c:723: nouveau_pushbuf_data: Assertion `kref’ failed.
Received signal 6
#0 0x7f10c3e6558e
#1 0x7f10c3e62743
#2 0x7f10c3e65505
#3 0x7f10bd5bbf60
#4 0x7f10bd5bbed7 gsignal
#5 0x7f10bd59d535 abort
#6 0x7f10bd59d40f
#7 0x7f10bd5ad012 __assert_fail
#8 0x7f10ac1cb46f nouveau_pushbuf_data
#9 0x7f10ac1cb3d3 nouveau_pushbuf_data
#10 0x7f10ac1cb4ff
#11 0x7f10ac1cb94f
#12 0x7f10ac1cc540 nouveau_pushbuf_kick
#13 0x7f109f5a4726
#14 0x7f109f6ce96f
#15 0x7f109f2a2d4f
#16 0x7f10ac6c0403
#17 0x7f10acfaf196
#18 0x7f10be13248b QOpenGLContext::swapBuffers()
#19 0x7f10be3d8504 QPlatformBackingStore::composeAndFlush()
#20 0x7f10b05696f4
#21 0x7f10be6f337d
#22 0x7f10be6f4db4
#23 0x7f10be6f63c2
#24 0x7f10be6f6729
#25 0x7f10be70e035 QWidgetPrivate::syncBackingStore()
#26 0x7f10be725c88 QWidget::event()
#27 0x7f10be6e6551 QApplicationPrivate::notify_helper()
#28 0x7f10be6ed930 QApplication::notify()
#29 0x7f10bdd1e8e9 QCoreApplication::notifyInternal2()
#30 0x7f10be6f7393
#31 0x7f10be6f80b7
#32 0x7f10be70fddb QWidget::repaint()
#33 0x7f10be70fe3c QWidget::repaint()
#34 0x7f10be869ef8 QProgressBar::setValue()
#35 0x7f10bdd48563 QMetaObject::activate()
#36 0x7f10c8637e91 QWebEngineView::loadProgress()
#37 0x7f10bdd48563 QMetaObject::activate()
#38 0x7f10c8627451 QWebEnginePage::loadProgress()
#39 0x7f10bdd54166
#40 0x7f10bdd48c5b QObject::event()
#41 0x7f10be6e6551 QApplicationPrivate::notify_helper()
#42 0x7f10be6ed930 QApplication::notify()
#43 0x7f10bdd1e8e9 QCoreApplication::notifyInternal2()
#44 0x7f10bdd71453 QTimerInfoList::activateTimers()
#45 0x7f10bdd71ca4
#46 0x7f10bcfb1aae g_main_context_dispatch
#47 0x7f10bcfb1d48
#48 0x7f10bcfb1ddc g_main_context_iteration
#49 0x7f10bdd72047 QEventDispatcherGlib::processEvents()
#50 0x7f10bdd1d5bb QEventLoop::exec()
#51 0x7f10bdd255e2 QCoreApplication::exec()
#52 0x55fec604104c main
#53 0x7f10bd59eb6b __libc_start_main
#54 0x55fec604150a _start
r8: 0000000000000000 r9: 00007fff5d777b10 r10: 0000000000000008 r11: 0000000000000246
r12: 00007f10ac1ce052 r13: 00007f10ac1ce068 r14: 00000000000002d3 r15: 0000000000000000
di: 0000000000000002 si: 00007fff5d777b10 bp: 00007f10bd72b588 bx: 0000000000000000
dx: 0000000000000000 ax: 0000000000000000 cx: 00007f10bd5bbed7 sp: 00007fff5d777b10
ip: 00007f10bd5bbed7 efl: 0000000000000246 cgf: 002b000000000033 erf: 0000000000000000
trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]
Calling _exit(1). Core file will not be generated.


nouveau: kernel rejected pushbuf: No such file or directory
nouveau: ch3: krec 0 pushes 0 bufs 1 relocs 0
nouveau: ch3: buf 00000000 00000004 00000004 00000004 00000000
Received signal 11 000000000000
#0 0x7f8be970f58e
#1 0x7f8be970c743
#2 0x7f8be970f505
#3 0x7f8be2e65f60
#4 0x7f8be9063c3e
#5 0x7f8be90640df
#6 0x7f8be939808f
#7 0x7f8be93a6118
#8 0x7f8be91c5359
#9 0x7f8be91c5521
#10 0x7f8be91cc477
#11 0x7f8be91cc691
#12 0x7f8be91ae3d1
#13 0x7f8be91d0f34
#14 0x7f8be91d1099
#15 0x7f8be929f0b5
#16 0x7f8be9677263
#17 0x7f8be969d809
#18 0x7f8be969e25f
#19 0x7f8be969e3e8
#20 0x7f8be7ae0e44
#21 0x7f8be35f2c5b QObject::event()
#22 0x7f8be3f90551 QApplicationPrivate::notify_helper()
#23 0x7f8be3f97930 QApplication::notify()
#24 0x7f8be35c88e9 QCoreApplication::notifyInternal2()
#25 0x7f8be35cb927 QCoreApplicationPrivate::sendPostedEvents()
#26 0x7f8be361ca43
#27 0x7f8be285baae g_main_context_dispatch
#28 0x7f8be285bd48
#29 0x7f8be285bddc g_main_context_iteration
#30 0x7f8be361c047 QEventDispatcherGlib::processEvents()
#31 0x7f8be35c75bb QEventLoop::exec()
#32 0x7f8be35cf5e2 QCoreApplication::exec()
#33 0x5561317aa04c main
#34 0x7f8be2e48b6b __libc_start_main
#35 0x5561317aa50a _start
r8: 0000000000000001 r9: 0000000000000003 r10: 0000000000000001 r11: 0000000000000000
r12: 00007ffc2f18ebe0 r13: 00007ffc2f18ec00 r14: 0000000000000001 r15: 00005561329336c0
di: 00005561329336c0 si: 0000556132a9b4d0 bp: 00007ffc2f18ebb0 bx: 0000556132d12ac0
dx: 00005561329336d0 ax: 00005561329388b0 cx: 00005561329336d0 sp: 00007ffc2f18eb70
ip: 00007f8be9063c3e efl: 0000000000010202 cgf: 002b000000000033 erf: 0000000000000000
trp: 000000000000000d msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]
Calling _exit(1). Core file will not be generated.

Exact same issue here. But Ubuntu 18.10 LTS
Did you ever solve this?

You should probably create a bug report on https://github.com/nextcloud/desktop/issues

I do have the same problem, when adding a second account.

Same issue Kali GNU/Linux Rolling

$ ./Nextcloud-2.6.2-x86_64.AppImage 
Nextcloud-2.6.2-x86_64.AppImage: ../nouveau/pushbuf.c:723: nouveau_pushbuf_data: Assertion `kref' failed.
Aborted

Which package formats are you guys having issues on DEB, RPM, Flatpak, Snap, or AppImage?