I think this was a bug that was fixed in plymouth several months ago, but it's hard to tell without seeing a longer log of your apt output (/var/log/apt/term.log* should contain the error, and context).
I think this was a bug that was fixed in plymouth several months ago, but it's hard to tell without seeing a longer log of your apt output (/var/log/ apt/term. log* should contain the error, and context).