run
Fcitx Configtool
Found that the "Input Method" tab is empty, like
I tried many methods I found, I also tried reinstalling fcitx and its dependencies without preserving the configuration files, and using the aforementioned methods to operate iBus, but still did not solve the problem
Later, it was found that there was at least one current keyboard layout under the "Input Method" tab of the window in the above figure in some of the materials found, such as "Keyboard-English (US)", so I changed my mind and searched to add a keyboard to the operating system. Layout method, after going through the process of adding keyboard layout, fcitx settings-> "input method" tab suddenly there is the current keyboard layout and fcitx's own input method, as shown below
Finally, input method frameworks such as fcitx and iBus can work normally