If you have any other advices about security youre welcome.
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W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/libnss-systemd_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/udev_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/libudev1_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/libsystemd0_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/systemd_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/systemd-timesyncd_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/universe/s/systemd/systemd-coredump_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/libpam-systemd_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/systemd-sysv_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/samba/libsmbclient_4.11.6+dfsg-0ubuntu1.9_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/samba/smbclient_4.11.6+dfsg-0ubuntu1.9_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/samba/samba-common-bin_4.11.6+dfsg-0ubuntu1.9_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/samba/python3-samba_4.11.6+dfsg-0ubuntu1.9_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/samba/libwbclient0_4.11.6+dfsg-0ubuntu1.9_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/samba/samba-libs_4.11.6+dfsg-0ubuntu1.9_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/samba/samba-common_4.11.6+dfsg-0ubuntu1.9_all.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/a/alsa-ucm-conf/alsa-ucm-conf_1.2.2-1ubuntu0.8_all.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/l/linux-base/linux-base_4.5ubuntu3.5_all.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/l/linux-firmware/linux-firmware_1.187.15_all.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/linux-meta/linux-generic_5.4.0.77.80_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/linux-meta/linux-image-generic_5.4.0.77.80_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/linux-meta/linux-headers-generic_5.4.0.77.80_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/linux/linux-libc-dev_5.4.0-77.86_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/t/thunderbird/thunderbird_78.11.0+build1-0ubuntu0.20.04.2_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/t/thunderbird/thunderbird-gnome-support_78.11.0+build1-0ubuntu0.20.04.2_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/t/thunderbird/xul-ext-lightning_78.11.0+build1-0ubuntu0.20.04.2_amd64.deb
404 Not Found [IP: 91.189.88.142 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/libnss-myhostname_245.4-4ubuntu3.7_amd64.deb
404 Not Found [IP: 91.189.88.142 80]