/usr/share/X11/xkb/symbols/es

es

key <AE01> {[ exclam,           1,                  bar,            exclamdown ]};
key <AE02> {[ quotedbl,         2,                  at,             twosuperior ]};
key <AE03> {[ periodcentered,   3,                  numbersign,     sterling ]};
key <AE04> {[ dollar,           4,                  asciitilde,     dollar ]};
key <AE05> {[ percent,          5,                  brokenbar,      fiveeighths ]};
key <AE06> {[ ampersand,        6,                  notsign,        fiveeighths ]};
key <AE07> {[ slash,            7,                  onehalf,        seveneighths ]};
key <AE08> {[ parenleft,        8,                  oneeighth,      threeeighths ]};
key <AE09> {[ parenright,       9,                  asciicircum ]};
key <AE10> {[ equal,            0,                  grave,          dead_doubleacute ]};
key <LSGT> {[ greater,          less,               guillemotleft,  guillemotright ]};
key <BKSL> {[ braceright,       Ccedilla,           ccedilla,       dead_breve ]};
key <AC11> {[ braceleft,        dead_diaeresis,     dead_acute,     braceleft ]};
key <AD11> {[ bracketleft,      dead_circumflex,    dead_grave,     dead_abovering ]};
key <AD12> {[ bracketright,     asterisk, plus,     dead_macron ]};
key <TLDE> {[ backslash,        ordfeminine,        masculine,      backslash ]};

# setxkbmap -layout es
# systemctl restart keyboard-setup

Añadidos

key <BKSL> {[ braceright,       Ccedilla,           ccedilla,       dead_breve ]};
key <AC11> {[ braceleft,        dead_diaeresis,     dead_acute,     braceleft ]};
key <AD11> {[ bracketleft,      dead_circumflex,    dead_grave,     dead_abovering ]};
key <AD12> {[ bracketright,     asterisk, plus,     dead_macron ]};
key <TLDE> {[ backslash,        ordfeminine,        masculine,      backslash ]};