Thanks to a member of the BrlTTY mailing list, my problem is solved. It
seems that the default authorization of BrltTTY under Ubuntu was no
longer working. Providing it with a dummy key-file was enough to get it
back to work - instantly.

The display came back to life immediately after these steps:
- edit /etc/brltty.conf, uncomment the line "api-parameters 
Auth=keyfile:/etc/brlapi.key"
- sudo touch /etc/brlapi.key
- sudo chmod 0644 /etc/brlapi.key

For me, the issue is solved.

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https://bugs.launchpad.net/bugs/1782320

Title:
  Braille display inoperable in GUI since polkit-update

Status in brltty package in Ubuntu:
  New

Bug description:
  $ lsb_release -rd
  Description:  Ubuntu 18.04 LTS
  Release:      18.04

  $ apt-cache policy brltty
  brltty:
    Installed: 5.5-4ubuntu2
    Candidate: 5.5-4ubuntu2
    Version table:
   *** 5.5-4ubuntu2 500
          500 http://nl.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  $ apt-cache policy policykit-1-gnome 
  policykit-1-gnome:
    Installed: (none)
    Candidate: 0.105-6ubuntu2
    Version table:
       0.105-6ubuntu2 500
          500 http://nl.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

  Expected behavior:
  After a system upgrade, the braille display should function as before the 
upgrade.

  Actual behavior:
  Since the upgrade, the braille display only works in console mode 
(Ctrl+Alt+F3, -F4, etc.)
  In GUI mode, the display reads "Screen not in text mode".
  Restarting Orca (screenreader) has no effect. Restarting the system has no 
effect.

  This is the upgrade command, taken from /var/log/apt/history.log:
  Start-Date: 2018-07-17  07:47:02
  Commandline: /usr/bin/unattended-upgrade
  Upgrade: libpolkit-gobject-1-0:amd64 (0.105-20, 0.105-20ubuntu0.18.04.1), 
libpolkit-agent-1-0:amd64 (0.105-20, 0.105-20ubuntu0.18.04.1), 
libpolkit-backend-1-0:amd64 (0.105-20, 0.105-20ubuntu0.18.04.1), 
policykit-1:amd64 (0.105-20, 0.105-20ubuntu0.18.04.1), gir1.2-polkit-1.0:amd64 
(0.105-20, 0.105-20ubuntu0.18.04.1)
  End-Date: 2018-07-17  07:47:04

  These are the error messages taken from /var/log/syslog:
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: 
polkit_authority_check_authorization_sync error 11: Resource temporarily 
unavailable.
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: brltty: 
polkit_authority_check_authorization_sync error 11: Resource temporarily 
unavailable.
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: BrlAPI connection fd=22 accepted: 
local <unnamed>
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: brltty: BrlAPI connection fd=22 
accepted: local <unnamed>
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: 
polkit_authority_check_authorization_sync error 11: Resource temporarily 
unavailable.
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: brltty: 
polkit_authority_check_authorization_sync error 11: Resource temporarily 
unavailable.
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: BrlAPI connection fd=22 accepted: 
local <unnamed>
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: brltty: BrlAPI connection fd=22 
accepted: local <unnamed>
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: 
polkit_authority_check_authorization_sync error 11: Resource temporarily 
unavailable.
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: brltty: 
polkit_authority_check_authorization_sync error 11: Resource temporarily 
unavailable.
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: BrlAPI connection fd=22 accepted: 
local <unnamed>
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: brltty: BrlAPI connection fd=22 
accepted: local <unnamed>
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: 
polkit_authority_check_authorization_sync error 11: Resource temporarily 
unavailable.
  Jul 18 10:55:34 WaanzinsPC2 brltty[2635]: brltty: 
polkit_authority_check_authorization_sync error 11: Resource temporarily 
unavailable.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: brltty 5.5-4ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Wed Jul 18 11:03:27 2018
  ExecutablePath: /bin/brltty
  InstallationDate: Installed on 2018-05-15 (63 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  LocalLibraries: /usr/local/lib/libgpg-error.so.0.24.2 
/usr/local/lib/libgcrypt.so.20.2.2
  SourcePackage: brltty
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.brltty.conf: 2018-05-16T09:36:35.497752

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