Unable to update nor install sqlite3 on rk3228 nand legacy kernel tvbox

Good afternoon.

I was implementing an mqtt broker on my rk3228a tv box, and when i try to apt-get install sqlite3, i am greeted with this error:

Depois desta operação, 1.769 kB adicionais de espaço em disco serão usados.
Ign:1 http://ports.ubuntu.com focal-security/main armhf sqlite3 armhf 3.31.1-4ubuntu0.2
Err:1 http://ports.ubuntu.com focal-security/main armhf sqlite3 armhf 3.31.1-4ubuntu0.2
  404  Not Found [IP: 185.125.190.36 80]
E: Falhou ao buscar http://ports.ubuntu.com/pool/main/s/sqlite3/sqlite3_3.31.1-4ubuntu0.2_armhf.deb  404  Not Found [IP: 185.125.190.36 80]
E: Impossível buscar alguns arquivos, talvez executar apt-get update ou tentar com --fix-missing?

This is fine, i figured i'd just update my armbian distro, and then i see this:

Atingido:2 http://ports.ubuntu.com focal InRelease
Ign:3 https://apt.postgresql.org/pub/repos/apt focal-pgdg InRelease
Obter:1 http://mirrors.jevincanders.net/armbian/apt focal InRelease [52,4 kB]
Err:4 https://apt.postgresql.org/pub/repos/apt focal-pgdg Release
  Certificate verification failed: The certificate is NOT trusted. The certificate chain uses not yet valid certificate.  Could not handshake: Error in the certificate verification. [IP: 87.238.57.227 443]
Obter:5 http://ports.ubuntu.com focal-security InRelease [114 kB]
Obter:6 http://ports.ubuntu.com focal-updates InRelease [114 kB]
Obter:7 http://ports.ubuntu.com focal-backports InRelease [108 kB]
Lendo listas de pacotes... Pronto
E: The repository 'https://apt.postgresql.org/pub/repos/apt focal-pgdg Release' does not have a Release file.
N: Atualizações a partir de tal repositório não podem ser feitas de forma segura e estão, portanto, desativadas por definição.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Release file for http://apt.armbian.com/dists/focal/InRelease is not valid yet (invalid for another 537d 21h 42min 33s). Updates for this repository will not be applied.
E: Release file for http://ports.ubuntu.com/dists/focal-security/InRelease is not valid yet (invalid for another 643d 7h 55min 19s). Updates for this repository will not be applied.
E: Release file for http://ports.ubuntu.com/dists/focal-updates/InRelease is not valid yet (invalid for another 643d 11h 10min 29s). Updates for this repository will not be applied.
E: Release file for http://ports.ubuntu.com/dists/focal-backports/InRelease is not valid yet (invalid for another 632d 18h 39min 2s). Updates for this repository will not be applied.

I know i'm using legacy kernel, but is there no way to get the latest updates for this outdated version?

I'd really appreciate some insight into this. Thanks