In principle, you should know the details of your installation procedure in order to be able to fully undo the installation. In as far as I see, everything from the compilation is under a target/release/alacritty somewhere. From there, you manually moved things out to /usr/local/bin and other places, as indicated under Desktop Entry. Just undo these actions.

• Remove /usr/local/bin/alacritty. Already from now on, the new version will be the one that you launch with the command alacritty


• Remove /usr/share/pixmaps/Alacritty.svg


• With respect to Alacritty.desktop, be carefull. It is most likely in /usr/share/applications when it is installed using desktop-file-install. It could have been overwritten by your PPA install, although some PPA's package the desktop file as com.alacritty.Alacritty.desktop. If the latter file exists in /usr/share/applications, then you can remove Alacritty.desktop. IF that file is not there, it may be elsewhere on your system. If needed, search where it is. You can then do a sudo update-desktop-database to update the system that that launcher is gone.


• Finally, remove the folder where the compiled files were placed if you did not already.

Some background: When you installed Alacritty from the PPA, the binary will be located in /usr/bin. However, the version that you have compiled manually is, if you followed all instructions, in /usr/local/bin. The latter folder comes earlier in the search path for applications (look at that path with the command echo $PATH). So despite installing the PPA version, the manually compiled version continues to be the one that is executed.