/usr/share/lintian/overrides/libicu55 is in libicu55 55.1-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # libicu55 installs multiple shared libraries, none of which is
# actually called libicu.so.55, but all of which are libicu*.so.55.
libicu55: package-name-doesnt-match-sonames
|