It definitely sounds like you have residual pieces of other installs getting in the way, but I'm confused about the need to modify the instructions "following an error prompt." All Ubuntu instructions already have python3-* indicated where necessary, and sudo indicated where required. There should be no `sudo make` needed.
Quote:
The following command can be copied and pasted for convenience on Debian-based systems:
sudo apt-get install python3-dev python3-pip python3-lxml python3-six python3-css-parser python3-dulwich
Once the cmake configure command finishes with no errors, build Sigil with:
make (or make -j4 if you have plenty of processor cores)
Installing Sigil
If all goes well, install Sigil with:
sudo make install
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