I can only open /usr/share/X11/xkb/symbols/gb read-only
Have you tried this as superuser?
Try sudo nano /usr/share/X11/xkb/symbols/gb or whatever your editor of choice is
sudo nano /usr/share/X11/xkb/symbols/gb
or whatever your editor of choice is
Or emacs if you hate yourself
@NotThamesWater started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Have you tried this as superuser?
Try
sudo nano /usr/share/X11/xkb/symbols/gb
or whatever your editor of choice is