/usr/share/X11/xkb/symbols/me is in xkb-data 2.10.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66  | // Montenegro keyboard mapping
//
// Initially, a copy of Serbian variants
//
default  partial alphanumeric_keys
xkb_symbols "basic" {
  include "rs(latin)"
  name[Group1]= "Montenegrin";
  key <AD06> { [ any, any, zacute, Zacute ] }; // z
  key <AC02> { [ any, any, sacute, Sacute ] }; // s
};
partial alphanumeric_keys
xkb_symbols "cyrillic" {
  include "rs(basic)"
  name[Group1]= "Montenegrin (Cyrillic)";
};
partial alphanumeric_keys
xkb_symbols "cyrillicyz" {
  include "rs(yz)"
  name[Group1]= "Montenegrin (Cyrillic, Z and ZHE swapped)";
};
partial alphanumeric_keys
xkb_symbols "latinunicode" {
  include "rs(latinunicode)"
  name[Group1]= "Montenegrin (Latin Unicode)";
  key <AD06> { [ any, any, zacute, Zacute ] }; // z
  key <AC02> { [ any, any, sacute, Sacute ] }; // s
};
partial alphanumeric_keys
xkb_symbols "latinyz" {
  include "rs(latinyz)"
  name[Group1]= "Montenegrin (Latin qwerty)";
  key <AB02> { [ any, any, zacute, Zacute ] }; // z
  key <AC02> { [ any, any, sacute, Sacute ] }; // s
};
partial alphanumeric_keys
xkb_symbols "latinunicodeyz" {
  include "rs(latinunicodeyz)"
  name[Group1]= "Montenegrin (Latin Unicode qwerty)";
  key <AB02> { [ any, any, zacute, Zacute ] }; // z
  key <AC02> { [ any, any, sacute, Sacute ] }; // s
};
xkb_symbols "cyrillicalternatequotes" {
  include "rs(alternatequotes)"
  name[Group1]= "Montenegrin (Cyrillic with guillemets)";
};
xkb_symbols "latinalternatequotes" {
  include "rs(latinalternatequotes)"
  name[Group1]= "Montenegrin (Latin with guillemets)";
  key <AD06> { [ any, any, zacute,        Zacute         ] }; // z
  key <AC02> { [ any, any, sacute,        Sacute         ] }; // s
  key <LSGT> { [ any, any, guillemotleft, guillemotright ] }; // <
};
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