emacs instantly crashes when used in gui mode

[Sadon Albader]

Terminal output:
Fatal error 6: Aborted
Backtrace:
emacs[0x5194a2]
emacs[0x4febb1]
emacs[0x519559]
emacs[0x445315]
emacs[0x4fea4a]
emacs[0x4caadd]
emacs[0x4ce828]
emacs[0x4ce8be]
/lib/x86_64-linux-gnu/libX11.so.6(_XError+0xfb)[0x7fe9d10a10db]
/lib/x86_64-linux-gnu/libX11.so.6(+0x3de47)[0x7fe9d109de47]
/lib/x86_64-linux-gnu/libX11.so.6(+0x3dee5)[0x7fe9d109dee5]
/lib/x86_64-linux-gnu/libX11.so.6(_XEventsQueued+0x52)[0x7fe9d109e832]
/lib/x86_64-linux-gnu/libX11.so.6(XFlush+0x1e)[0x7fe9d107fcee]
/lib/x86_64-linux-gnu/libX11.so.6(+0x5df16)[0x7fe9d10bdf16]
/lib/x86_64-linux-gnu/libX11.so.6(XDestroyIC+0x16)[0x7fe9d10abee6]
emacs[0x4e09b0]
emacs[0x4d88bc]
emacs[0x4d8faf]
emacs[0x42d8ac]
emacs[0x4caa93]
emacs[0x4ce828]
emacs[0x4ce8be]
/lib/x86_64-linux-gnu/libX11.so.6(_XError+0xfb)[0x7fe9d10a10db]
/lib/x86_64-linux-gnu/libX11.so.6(+0x3de47)[0x7fe9d109de47]
/lib/x86_64-linux-gnu/libX11.so.6(+0x3dee5)[0x7fe9d109dee5]
/lib/x86_64-linux-gnu/libX11.so.6(_XEventsQueued+0x52)[0x7fe9d109e832]
/lib/x86_64-linux-gnu/libX11.so.6(XPending+0x61)[0x7fe9d1090171]
/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x7020f)[0x7fe9d173b20f]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_prepare+0x19f)[0x7fe9d121772f]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x520db)[0x7fe9d12180db]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_pending+0x2c)[0x7fe9d121827c]
/lib/x86_64-linux-gnu/libgtk-3.so.0(gtk_events_pending+0x12)[0x7fe9d1a20392]
emacs[0x4cb38d]
emacs[0x505f82]
emacs[0x506625]
emacs[0x55eced]
emacs[0x57799d]
emacs[0x5b2504]
emacs[0x57a57a]
emacs[0x577afb]
emacs[0x5b2504]
...
[1] 21618 abort (core dumped) emacs

Tested on multiple machines (two amd64 laptops and one ppc64el Talos workstation) all have same issue. Runs fine on 18.04 LTS
Also works fine on focal if used in tty or explicitly disable GTK using "emacs --no-window-system"

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: emacs 1:26.3+1-1ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu26
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon Apr 13 02:13:31 2020
PackageArchitecture: all
SourcePackage: emacs
UpgradeStatus: No upgrade log present (probably fresh install)