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I am not an expert in installing keyboard layouts, these instructions may not work for all Linux users.
1. First, backup some files by running these commands:
cp /usr/share/X11/xkb/symbols/tr /usr/share/X11/xkb/symbols/tr.old
cp /usr/share/X11/xkb/rules/evdev.xml /usr/share/X11/xkb/rules/evdev.xml.old
If you get an error, first run this command: su root, then try running the commands again, or replace cp with sudo cp.
2. Open file /usr/share/X11/xkb/symbols/tr and append the following text block at the end of the file:
// homepage: salif.github.io/colemak-tr
// version: 1
partial alphanumeric_keys
xkb_symbols "colemak_tr" {
include "us(colemak)"
name[Group1]= "Turkish (Colemak)";
key <AD01> {[ odiaeresis, Odiaeresis, q, Q ]};
key <AD02> {[ scedilla, Scedilla, w, W ]};
key <AD10> {[ gbreve, Gbreve, semicolon, colon ]};
key <AD11> {[ udiaeresis, Udiaeresis, bracketleft, braceleft ]};
key <AD12> {[ apostrophe, quotedbl, bracketright, braceright ]};
key <AC09> {[ i, Iabovedot ]};
key <AC11> {[ idotless, I ]};
key <AB02> {[ ccedilla, Ccedilla, x, X ]};
include "level3(ralt_switch)"
};
3. Open file /usr/share/X11/xkb/rules/evdev.xml and insert the following text block after the variant Turkish (Alt-Q):
<variant>
<configItem>
<name>colemak_tr</name>
<description>Turkish (Colemak)</description>
</configItem>
</variant>
4. Then add Turkish (Colemak) via the settings of your desktop environment.
To uninstall restore the old files or undo everything you did:
mv /usr/share/X11/xkb/symbols/tr.old /usr/share/X11/xkb/symbols/tr
mv /usr/share/X11/xkb/rules/evdev.xml.old /usr/share/X11/xkb/rules/evdev.xml
Uninstall the old version and install the new version.
Changes you make to files in the /usr/share/X11/xkb directory will be lost when the package owning that directory is updated, for example on Arch Linux this package is called xkeyboard-config. You must either make the same changes every time you update this package or turn off updates for this package. You also have the option to make a custom package that contains these changes and replaces the original package.