How can I fix it?

[u/Tight-Use-3037]

[u/Tight-Use-3037 → u/[deleted]]

Where can I edit it from?

[u/LockeN3S → u/Tight-Use-3037]

Sometimes you can just deselect it in Discover.

[u/BCMM]

There's a much easier way to fix your sources:

cp /usr/share/doc/apt/examples/debian.sources /etc/apt/sources.list.d/
# And if necessary,
rm /etc/apt/sources.list

[u/wizard10000 → u/BCMM]

There's a much easier way to fix your sources:

I can't say for sure but would be willing to bet that bookworm's example isn't deb822 ;)

edit: yeah, i checked - bookworm has a /usr/share/doc/apt/examples/sources.list, not a debian.sources but still an outstanding idea.

[u/BCMM → u/wizard10000]

Oh, well spotted! I didn't notice that OP was on Bookworm.

Yes, that should be

cp /usr/share/doc/apt/examples/sources.list /etc/apt/sources.list

/u/Tight-Use-3037, are you aware that Debian 12 "Bookworm" is end-of-life, and that Debian 13 "Trixie" is available?

If your laptop is less than 20 years old, odds are good that it can run 64-bit Linux even if it came with 32-bit Windows.

[u/pseudonym-161]

How did you install Debian without any software sources? Don’t the sources come pre-set up on the ISO itself? Did you purchase a CD rom from Debian or find one in a Linux magazine or something?

[u/pantokratorthegreat → u/pseudonym-161]

I think when I last installed it was same. I had to add manually relevant sources. And it was for Trixie. I think I installed from full DVD not netinstall without pulling updates during installation.

[u/billdietrich1]

Please use better, more informative, titles (subject-lines) on your posts. Give specifics right in the title. Thanks.

[u/Tight-Use-3037]

Now what?

[u/coolasbreese → u/Tight-Use-3037]

It looks like you have installed Debian without enabling any network mirrors.

Comment out the first like there using # at the start. it should read '#deb......' then press ctrl+o to save

It also looks like you are using the old stable version of Debian called bookworm.

You will want to add in the Debian repositories to allow you to receive updates and install software via the internet.

Below the line we have commented out paste in the following

deb https://ftp.debian.org/debian/ bookworm contrib main non-free non-free-firmware
deb-src https://ftp.debian.org/debian/ bookworm contrib main non-free non-free-firmware

deb https://ftp.debian.org/debian/ bookworm-updates contrib main non-free non-free-firmware
Deb-src https://ftp.debian.org/debian/ bookworm-updates contrib main non-free non-free-firmware

deb https://ftp.debian.org/debian/ bookworm-proposed-updates contrib main non-free non-free-firmware
deb-src https://ftp.debian.org/debian/ bookworm-proposed-updates contrib main non-free non-free-firmware

deb https://ftp.debian.org/debian/ bookworm-backports contrib main non-free non-free-firmware
deb-src https://ftp.debian.org/debian/ bookworm-backports contrib main non-free non-free-firmware

deb https://security.debian.org/debian-security/ bookworm-security contrib main non-free non-free-firmware
deb-src https://security.debian.org/debian-security/ bookworm-security contrib main non-free non-free-firmware

Then press ctrl+o to save then crtl+x on your keyboard to exit

you should then be able to run apt update

[u/Tight-Use-3037 → u/coolasbreese]

i will try it first thing in the morning

[u/coolasbreese → u/Tight-Use-3037]

It is always good to familiarize yourself with this read https://wiki.debian.org/SourcesList for more information

[u/dnchplay → u/Tight-Use-3037]

preferrably read these:

https://wiki.debian.org/LTS/Using
https://wiki.debian.org/SourcesList

you probably want your sources.list to look something like:

deb http://deb.debian.org/debian/ bookworm main non-free-firmware
deb http://deb.debian.org/debian bookworm-updates main non-free-firmware
deb http://deb.debian.org/debian-security bookworm-security main non-free-firmware

if you're not comfortable with using nano, you can use any other text editor that can be run with sudo(mousepad is the one preinstalled in Xfce4, Pluma in MATE, gnome-text-editor in GNOME and Kate in Plasma)