I’m using the “cr3 version” of darktable from AUR (http://aur.archlinux.org/packages/darktable-cr3-git) and it suddenly stopped working. When I try to open darktable from the terminal, it shows the following message:
/usr/bin/darktable: error while loading shared libraries: libicui18n.so.69: cannot open shared object file: No such file or directory
Aur packages will not detect if dependencies have changed and automatically rebuild afaik so rebuilding it should be the first thing you do if something stops working.
I suggest not to use the cr3 version in AUR anymore. Instead, use darktable-git, which should now support CR3 (by means of libraw, instead of rawspeed).