@Paijo has already confirmed it is Ubuntu bug LP#739184. Related LO bug is fdo#57104, which has been closed as NOTOURBUG. Also refer this question, which appears to be the same but for Ubuntu 12.04.
These are not shortcuts and I have edited your question to be more accurate in this respect. These are menu accelerator keys i.e., the underscored values of the text menu entries, thus the “F” of “File”, the “E” of “Edit”, etc. They are a way of using the keyboard to mimic mouse clicks. Same number of keystrokes required as mouse clicks, thus not a shortcut.
Keyboard shortcuts are defined under Tools > Customise… > Keyboard tab. These are a shorthand way of accessing a function that would normally take more mouse clicks when going via the menu. This is why they are called a “shortcut”.