On Sat, Sep 04, 2021 at 11:04:49PM -0300, Dedeco Balaco wrote: > So, i should to 2 upgrades: one to Debian 10, and one more to Debian 11. > Fine. And for each one, the steps are: > But after my first edition to sources.list, apt update fails. I have > tried apt-get update to, but it also fails for the apparently same reason. > > What should i do to solve this? Start by reading the error message. If you can't understand it, then paste it here.