update error

[teckman45]

Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://repository.spotify.com stable InRelease
Ign:3 http://ppa.launchpad.net/docky-core/stable/ubuntu bionic InRelease
Hit:4 http://archive.canonical.com bionic InRelease
Get:5 http://archive.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB]
Hit:6 https://repo.skype.com/deb stable InRelease
Hit:7 http://ppa.launchpad.net/onli/simdock/ubuntu bionic InRelease
Hit:8 https://deb.opera.com/opera-stable stable InRelease
Hit:9 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease
Get:10 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:11 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Ign:12 http://ppa.launchpad.net/pyxis/pyxis/ubuntu bionic InRelease
Get:13 http://archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages [271 kB]
Hit:14 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease
Get:15 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [301 kB]
Get:16 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [172 kB]
Err:17 http://ppa.launchpad.net/docky-core/stable/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Get:18 http://archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages [172 kB]
Err:19 http://ppa.launchpad.net/pyxis/pyxis/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Get:20 http://repo.linuxliteos.com/linuxlite diamond InRelease [2,104 B]
Get:21 http://repo.linuxliteos.com/linuxlite diamond/main amd64 Packages [13.1 kB]
Get:22 http://repo.linuxliteos.com/linuxlite diamond/main i386 Packages [7,430 B]
Reading package lists...
E: The repository 'http://ppa.launchpad.net/docky-core/stable/ubuntu bionic Release' does not have a Release file.
E: The repository 'http://ppa.launchpad.net/pyxis/pyxis/ubuntu bionic Release' does not have a Release file.

[Valtam]

Remove the last 2 PPA's they're not supported. See the Help Manual on adding PPA's.