apt-get update not working

I have a droplet with Ubuntu 20.04, but when I try to run apt-get update I get the following errors

Hit:1 https://repos.insights.digitalocean.com/apt/do-agent main InRelease
Hit:2 https://repos-droplet.digitalocean.com/apt/droplet-agent main InRelease
Hit:3 https://download.docker.com/linux/ubuntu focal InRelease
Err:4 http://mirrors.digitalocean.com/ubuntu focal InRelease
  Could not connect to mirrors.digitalocean.com:80 (2606:4700:3036::ac43:9447), connection timed out Could not connect to mirrors.digitalocean.com:80 (104.21.29.13), connection timed out Could not connect to mirrors.digitalocean.com:80 (2606:4700:3034::6815:1d0d), connection timed out Could not connect to mirrors.digitalocean.com:80 (172.67.148.71), connection timed out
Err:5 http://mirrors.digitalocean.com/ubuntu focal-updates InRelease
  Unable to connect to mirrors.digitalocean.com:http:
Err:6 http://mirrors.digitalocean.com/ubuntu focal-backports InRelease
  Unable to connect to mirrors.digitalocean.com:http:
Err:7 http://security.ubuntu.com/ubuntu focal-security InRelease
  Could not connect to security.ubuntu.com:80 (2001:67c:1562::18), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.38), connection timed out Could not connect to security.ubuntu.com:80 (2001:67c:1562::15), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.39), connection timed out Could not connect to security.ubuntu.com:80 (2620:2d:4000:1::16), connection timed out Could not connect to security.ubuntu.com:80 (185.125.190.36), connection timed out Could not connect to security.ubuntu.com:80 (2001:67c:1360:8001::24), connection timed out Could not connect to security.ubuntu.com:80 (91.189.88.142), connection timed out
Reading package lists... Done
W: Failed to fetch http://mirrors.digitalocean.com/ubuntu/dists/focal/InRelease  Could not connect to mirrors.digitalocean.com:80 (2606:4700:3036::ac43:9447), connection timed out Could not connect to mirrors.digitalocean.com:80 (104.21.29.13), connection timed out Could not connect to mirrors.digitalocean.com:80 (2606:4700:3034::6815:1d0d), connection timed out Could not connect to mirrors.digitalocean.com:80 (172.67.148.71), connection timed out
W: Failed to fetch http://mirrors.digitalocean.com/ubuntu/dists/focal-updates/InRelease  Unable to connect to mirrors.digitalocean.com:http:
W: Failed to fetch http://mirrors.digitalocean.com/ubuntu/dists/focal-backports/InRelease  Unable to connect to mirrors.digitalocean.com:http:
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/focal-security/InRelease  Could not connect to security.ubuntu.com:80 (2001:67c:1562::18), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.38), connection timed out Could not connect to security.ubuntu.com:80 (2001:67c:1562::15), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.39), connection timed out Could not connect to security.ubuntu.com:80 (2620:2d:4000:1::16), connection timed out Could not connect to security.ubuntu.com:80 (185.125.190.36), connection timed out Could not connect to security.ubuntu.com:80 (2001:67c:1360:8001::24), connection timed out Could not connect to security.ubuntu.com:80 (91.189.88.142), connection timed out
W: Some index files failed to download. They have been ignored, or old ones used instead.

I cannot install any packages… how can I solve this?