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This is for KDE5 with Dolphin as the file manager.
First we need to install xclip:
sudo apt-get install xclip
Next we then need create a desktop file at the following path: ~/.local/share/kservices5.
You may need to create the above directory.
Then run:
sudo nano ~/.local/share/kservices5/copy-path.desktop
Paste in the following:
[Desktop Action copy-path]
Exec=echo "%U" | tr -d '\n' | xclip -selection clipboard
Name=Copy Path
Icon=edit-copy
[Desktop Entry]
Actions=copy-path
ServiceTypes=KonqPopupMenu/Plugin
MimeType=all/all
Type=Service
X-KDE-Priority=TopLevel
Finally restart dolphin, a top level context menu should appear when you right click on a file, to copy its absolute path.