When i type sudo apt-get update I get
Hit:2 http://ppa.launchpad.net/linrunner/tlp/ubuntu focal InRelease Hit:3 http://security.ubuntu.com/ubuntu focal-security InRelease Hit:4 http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease Hit:5 http://gr.archive.ubuntu.com/ubuntu focal InRelease Hit:6 http://ppa.launchpad.net/papirus/papirus/ubuntu focal InRelease Hit:7 http://gr.archive.ubuntu.com/ubuntu focal-updates InRelease Hit:8 http://gr.archive.ubuntu.com/ubuntu focal-backports InRelease Reading package lists... Done W: Skipping acquire of configured file 'release/binary-amd64/Packages' as repository 'http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease' doesn't have the component 'release' (component misspelt in sources.list?) W: Skipping acquire of configured file 'release/binary-i386/Packages' as repository 'http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease' doesn't have the component 'release' (component misspelt in sources.list?) W: Skipping acquire of configured file 'release/i18n/Translation-en_US' as repository 'http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease' doesn't have the component 'release' (component misspelt in sources.list?) W: Skipping acquire of configured file 'release/i18n/Translation-en' as repository 'http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease' doesn't have the component 'release' (component misspelt in sources.list?) W: Skipping acquire of configured file 'release/dep11/Components-amd64.yml' as repository 'http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease' doesn't have the component 'release' (component misspelt in sources.list?) W: Skipping acquire of configured file 'release/dep11/icons-48x48.tar' as repository 'http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease' doesn't have the component 'release' (component misspelt in sources.list?) W: Skipping acquire of configured file 'release/dep11/icons-64x64.tar' as repository 'http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease' doesn't have the component 'release' (component misspelt in sources.list?) W: Skipping acquire of configured file 'release/dep11/icons-64x64@2.tar' as repository 'http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease' doesn't have the component 'release' (component misspelt in sources.list?) W: Skipping acquire of configured file 'release/cnf/Commands-amd64' as repository 'http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease' doesn't have the component 'release' (component misspelt in sources.list?)
What cat /etc/apt/sources.list gives me
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://gr.archive.ubuntu.com/ubuntu/ focal main restricted
# deb-src http://gr.archive.ubuntu.com/ubuntu/ focal main restricted
Major bug fix updates produced after the final release of the
distribution.
deb http://gr.archive.ubuntu.com/ubuntu/ focal-updates main restricted
deb-src http://gr.archive.ubuntu.com/ubuntu/ focal-updates main restricted
N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
team. Also, please note that software in universe WILL NOT receive any
review or updates from the Ubuntu security team.
deb http://gr.archive.ubuntu.com/ubuntu/ focal universe
deb-src http://gr.archive.ubuntu.com/ubuntu/ focal universe
deb http://gr.archive.ubuntu.com/ubuntu/ focal-updates universe
deb-src http://gr.archive.ubuntu.com/ubuntu/ focal-updates universe
N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
team, and may not be under a free licence. Please satisfy yourself as to
your rights to use the software. Also, please note that software in
multiverse WILL NOT receive any review or updates from the Ubuntu
security team.
deb http://gr.archive.ubuntu.com/ubuntu/ focal multiverse
deb-src http://gr.archive.ubuntu.com/ubuntu/ focal multiverse
deb http://gr.archive.ubuntu.com/ubuntu/ focal-updates multiverse
deb-src http://gr.archive.ubuntu.com/ubuntu/ focal-updates multiverse
N.B. software from this repository may not have been tested as
extensively as that contained in the main release, although it includes
newer versions of some applications which may provide useful features.
Also, please note that software in backports WILL NOT receive any review
or updates from the Ubuntu security team.
deb http://gr.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://gr.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
Uncomment the following two lines to add software from Canonical's
'partner' repository.
This software is not part of Ubuntu, but is offered by Canonical and the
respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu focal partner
deb-src http://archive.canonical.com/ubuntu focal partner
deb http://security.ubuntu.com/ubuntu focal-security main restricted
deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
deb http://security.ubuntu.com/ubuntu focal-security universe
deb-src http://security.ubuntu.com/ubuntu focal-security universe
deb http://security.ubuntu.com/ubuntu focal-security multiverse
deb-src http://security.ubuntu.com/ubuntu focal-security multiverse
This system was installed using small removable media
(e.g. netinst, live or single CD). The matching "deb cdrom"
entries were disabled at the end of the installation process.
For information about how to configure apt package sources,
see the sources.list(5) manual.
deb http://archive.ubuntu.com/ubuntu lucid-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu lucid-backports main restricted universe multiverse
cat /etc/apt/sources.listyou may need to remove the numix ppa if it's not compatible with focal – Nmath Jun 21 '20 at 18:26