Hello Everybody.

At this dead keys problem, I stumble upon now - however, so far, just in LibreOffice. Ever since a few weeks, I work at a fresh install of Kubuntu 16.04 - along with KDE Plasma 5.6.5, installed via the Kubuntu ppa backports. Dead keys work in all applications except LibreOffice - version 5.1.4.2. I am using the keyboard "USA International". A character like ä is no problem in most of the applications. They same applies for e.g. the double quotation mark (") - the key that needs to be pressed first in order to get ä. However, in Libreoffice in my configuration as summarised here, signs like " and ä do not show up. I have similar problems with characters like à, é, ë, ñ. č, etc. Also signs like `, ~ or ' do not show up in Writer or any other Libreoffice application. It does not matter whether I work in Dutch, English, Italian, French, German or whatever - the problem remains the same - however, as I said, just in LibreOffice. 


The only workaround I have found so far is editing a text in another application (Kate, BlueFish or whatever) and copy-pasting it into LibreOffice.  The workaround mentioned in comment 6 does not work here. I DO manage to invoke libreoffice from the command line -  "libreoffice" does end up in the following sequence:

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bas@Viaconsensus-transit:~$ unset XMODIFIERS && libreoffice &
[1] 5908
bas@Viaconsensus-transit:~$ W: Unknown node under /registry/extlang: deprecated
W: Unknown node under /registry/grandfathered: comments
W: Unknown node under /registry/grandfathered: comments
X Error: BadMatch (invalid parameter attributes) 8
  Major opcode: 42 (X_SetInputFocus)
  Resource id:  0x7c02342


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However, the problem is not being fixed like this. 

Variants like "libreoffice4.2" or "libreoffice5" do not produce any result.
On the other hand - the simple command line command "libreoffice", without anything else, is already enough to invoke that application. During my main working session of today, Tuesday 20 December 2016, I have done so by purpose. Here is the report I get from this working session. 

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bas@Viaconsensus-transit:~$ libreoffice
W: Unknown node under /registry/extlang: deprecated
W: Unknown node under /registry/grandfathered: comments
W: Unknown node under /registry/grandfathered: comments
X Error: BadMatch (invalid parameter attributes) 8
  Major opcode: 42 (X_SetInputFocus)
  Resource id:  0x7404614
X Error: BadMatch (invalid parameter attributes) 8
  Major opcode: 42 (X_SetInputFocus)
  Resource id:  0x7406fbd
X Error: BadMatch (invalid parameter attributes) 8
  Major opcode: 42 (X_SetInputFocus)
  Resource id:  0x74079cf
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
kbuildsycoca4 running...
LibreOffice(2110) KSambaSharePrivate::findSmbConf: KSambaShare: Could not find smb.conf! 
X Error: BadMatch (invalid parameter attributes) 8
  Major opcode: 42 (X_SetInputFocus)
  Resource id:  0x741bbd6
bas@Viaconsensus-transit:~$ libreoffice
W: Unknown node under /registry/extlang: deprecated
W: Unknown node under /registry/grandfathered: comments
W: Unknown node under /registry/grandfathered: comments
LibreOffice(3111) KSambaSharePrivate::findSmbConf: KSambaShare: Could not find smb.conf! 
bas@Viaconsensus-transit:~$ 


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Does someone know any other fix or effective workaround, apart from copy-paste?

Yours.

Bas G. Roufs.