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After updating to Ubuntu 18.04 LTS  the login screen shows no user names, just 
the user icons.
In the follow up screen some letters are missing e.g. "Cancel" is written "Ca  
l ", see screenshots.
https://www.pic-upload.de/view-35312811/ubuntu18.04.login-screen.png.html

If I toggle the text settings "large texts = on/off" the texts appear. (In this 
dropdown menu single letters are missing, too.)
So I think it might be a rendering problem.

Any hints?
Thanks in advance...

I am not sure if this is a bug by ubuntu or by me.


The output of dpkg -l | grep dm:

ii  bsdmainutils                                                11.1.2ubuntu1   
                            amd64        collection of more utilities from 
FreeBSD
ii  cups-ipp-utils                                              2.2.7-1ubuntu2  
                            amd64        Common UNIX Printing System(tm) - IPP 
developer/admin utilities
ii  dmeventd                                                    
2:1.02.145-4.1ubuntu3                       amd64        Linux Kernel Device 
Mapper event daemon
ii  dmidecode                                                   3.1-1           
                            amd64        SMBIOS/DMI table decoder
ii  dmsetup                                                     
2:1.02.145-4.1ubuntu3                       amd64        Linux Kernel Device 
Mapper userspace library
ii  dmz-cursor-theme                                            0.4.5ubuntu1    
                            all          Style neutral, scalable cursor theme
ii  ebtables                                                    
2.0.10.4-3.5ubuntu2                         amd64        Ethernet bridge frame 
table administration
ii  gdm3                                                        3.28.0-0ubuntu1 
                            amd64        GNOME Display Manager
ii  gir1.2-gdm-1.0                                              3.28.0-0ubuntu1 
                            amd64        GObject introspection data for the 
GNOME Display Manager
ii  iptables                                                    1.6.1-2ubuntu2  
                            amd64        administration tools for packet 
filtering and NAT
ii  libdmapsharing-3.0-2:amd64                                  2.9.39-2        
                            amd64        DMAP client and server library - 
runtime
rc  libdmtx0a:amd64                                             0.7.4-2         
                            amd64        Data Matrix barcodes (runtime library)
ii  libgdm1                                                     3.28.0-0ubuntu1 
                            amd64        GNOME Display Manager (shared library)
ii  liblightdm-gobject-1-0:amd64                                1.26.0-0ubuntu1 
                            amd64        LightDM GObject client library
ii  liblouisutdml-bin                                           2.7.0-1         
                            amd64        Braille UTDML translation utilities
ii  liblouisutdml-data                                          2.7.0-1         
                            all          Braille UTDML translation library - 
data
ii  liblouisutdml8:amd64                                        2.7.0-1         
                            amd64        Braille UTDML translation library - 
shared libs
ii  libnfsidmap2:amd64                                          0.25-5.1        
                            amd64        NFS idmapping library
ii  libpod-readme-perl                                          1.1.2-2         
                            all          Perl module to convert POD to README 
file
ii  libquadmath0:amd64                                          
8-20180414-1ubuntu2                         amd64        GCC Quad-Precision 
Math Library
ii  librdmacm1:amd64                                            17.1-1          
                            amd64        Library for managing RDMA connections
ii  libwildmidi-config                                          0.4.2-1         
                            all          software MIDI player configuration
rc  libwildmidi1:amd64                                          0.3.8-2         
                            amd64        software MIDI player library
ii  libwildmidi2:amd64                                          0.4.2-1         
                            amd64        software MIDI player library
ii  libxdmcp6:amd64                                             1:1.1.2-3       
                            amd64        X11 Display Manager Control Protocol 
library
ii  libxdmcp6:i386                                              1:1.1.2-3       
                            i386         X11 Display Manager Control Protocol 
library
ii  lightdm                                                     1.26.0-0ubuntu1 
                            amd64        Display Manager
ii  passwd                                                      1:4.5-1ubuntu1  
                            amd64        change and administer password and 
group data
ii  policykit-1                                                 0.105-20        
                            amd64        framework for managing administrative 
policies and privileges
ii  python3-padme                                               1.1.1-2         
                            all          mostly transparent proxy class for 
Python 3

** Affects: gdm (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Login Screen text missing
https://bugs.launchpad.net/bugs/1770850
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