Hi-ho,
Just done an apt-get dist-upgrade on my ubuntu 16.04 workstation and nextcloud client now fails to start with a core dump. Error from client is below.
Version of new client is 2.5.0-20181111.015125~xenial1
Workstation OS is Ubuntu 16.04. NC server 14.0.3 on Ubuntu 18.04.
[1117/112347:ERROR:icu_util.cc(162)] Invalid file descriptor to ICU data received.
[1117/112347:FATAL:content_main_runner.cc(714)] Check failed: base::i18n::InitializeICU().
#0 0x7fbc69e66f1e <unknown>
#1 0x7fbc69e7dc3e <unknown>
#2 0x7fbc6906f4ad <unknown>
#3 0x7fbc68531efd <unknown>
#4 0x7fbc685333a5 <unknown>
#5 0x7fbc68537cd5 QtWebEngineCore::WebEngineSettings::initDefaults()
#6 0x7fbc6d88675b <unknown>
#7 0x7fbc6d8868c8 QWebEngineProfile::QWebEngineProfile()
#8 0x5643e848e4c7 OCC::WebView::WebView()
#9 0x5643e848d095 OCC::WebViewPage::WebViewPage()
#10 0x5643e848a021 OCC::OwncloudWizard::OwncloudWizard()
#11 0x5643e83fed1e OCC::OwncloudSetupWizard::OwncloudSetupWizard()
#12 0x5643e8403262 OCC::OwncloudSetupWizard::runWizard()
#13 0x5643e83f3a14 OCC::ownCloudGui::slotOpenSettingsDialog()
#14 0x5643e839978b OCC::Application::slotCheckConnection()
#15 0x7fbc64b3a308 <unknown>
#16 0x7fbc64b2ebb3 QObject::event()
#17 0x7fbc6799605c QApplicationPrivate::notify_helper()
#18 0x7fbc6799b516 QApplication::notify()
#19 0x7fbc64aff38b QCoreApplication::notifyInternal()
#20 0x7fbc64b545ed QTimerInfoList::activateTimers()
#21 0x7fbc64b54af1 <unknown>
#22 0x7fbc62337197 g_main_context_dispatch
#23 0x7fbc623373f0 <unknown>
#24 0x7fbc6233749c g_main_context_iteration
#25 0x7fbc64b557cf QEventDispatcherGlib::processEvents()
#26 0x7fbc64afcb4a QEventLoop::exec()
#27 0x7fbc64b04bec QCoreApplication::exec()
#28 0x5643e8381b5d main
#29 0x7fbc63c2e830 __libc_start_main
#30 0x5643e8381fa9 _start