[ BUG ] I'm new on linux lite OS. How can I fix that problem?

[brkyzgn]

===========================
Install Updates Error log
===========================
Install Updates could not fetch the package cache information lists.
Go to https://www.linuxliteos.com/forums/ and paste the log below into a new or existing thread for assistance.

============ Log ===========

Aynı:  1 http://archive.canonical.com/ubuntu bionic InRelease
Yoksay:2 http://ppa.launchpad.net/noobslab/ppa-gimp/ubuntu bionic InRelease
Aynı:  3 http://repo.linuxliteos.com/linuxlite diamond InRelease
Aynı:  4 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease
Aynı:  5 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Aynı:  6 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease
Aynı:  7 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease
İndir: 8 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88,7 kB]
Hata:  9 http://ppa.launchpad.net/noobslab/ppa-gimp/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
İndir: 10 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74,6 kB]
Paket listeleri okunuyor...
E: 'http://ppa.launchpad.net/noobslab/ppa-gimp/ubuntu bionic Release' deposunda Release dosyası yok.

[Moltke]

===========================
Install Updates Error log
===========================
Install Updates could not fetch the package cache information lists.
Go to https://www.linuxliteos.com/forums/ and paste the log below into a new or existing thread for assistance.

============ Log ===========

Aynı:  1 http://archive.canonical.com/ubuntu bionic InRelease
Yoksay:2 http://ppa.launchpad.net/noobslab/ppa-gimp/ubuntu bionic InRelease
Aynı:  3 http://repo.linuxliteos.com/linuxlite diamond InRelease
Aynı:  4 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease
Aynı:  5 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Aynı:  6 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease
Aynı:  7 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease
İndir: 8 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88,7 kB]
Hata:  9 http://ppa.launchpad.net/noobslab/ppa-gimp/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
İndir: 10 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74,6 kB]
Paket listeleri okunuyor...
E: 'http://ppa.launchpad.net/noobslab/ppa-gimp/ubuntu bionic Release' deposunda Release dosyası yok.

There's no bionic release here http://ppa.launchpad.net/noobslab/ppa-gimp/ubuntu/ and that's why you get that error. If I may ask, why are you using a ppa for installing gimp? gimp's already installed.