$ sudo apt update
[sudo] password for user:
Get:1 file:/var/cuda-repo-10-0-local-10.0.326 InRelease
Ign:1 file:/var/cuda-repo-10-0-local-10.0.326 InRelease
Get:2 file:/var/visionworks-repo InRelease
Ign:2 file:/var/visionworks-repo InRelease
Get:3 file:/var/visionworks-sfm-repo InRelease
Ign:3 file:/var/visionworks-sfm-repo InRelease
Get:4 file:/var/visionworks-tracking-repo InRelease
Ign:4 file:/var/visionworks-tracking-repo InRelease
Get:5 file:/var/cuda-repo-10-0-local-10.0.326 Release [574 B]
Get:6 file:/var/visionworks-repo Release [1,999 B]
Get:7 file:/var/visionworks-sfm-repo Release [2,003 B]
Get:5 file:/var/cuda-repo-10-0-local-10.0.326 Release [574 B]
Get:8 file:/var/visionworks-tracking-repo Release [2,008 B]
Get:6 file:/var/visionworks-repo Release [1,999 B]
Get:7 file:/var/visionworks-sfm-repo Release [2,003 B]
Get:8 file:/var/visionworks-tracking-repo Release [2,008 B]
Err:11
http://turul.canonical.com bionic InRelease
502 Connection refused [IP: 91.189.91.11 80]
Err:14
http://turul.canonical.com bionic-updates InRelease
502 Connection refused [IP: 91.189.91.11 80]
Err:15
http://turul.canonical.com bionic-backports InRelease
502 Connection refused [IP: 91.189.91.11 80]
Err:16
http://turul.canonical.com bionic-security InRelease
502 Connection refused [IP: 91.189.91.11 80]
Get:18
https://repo.download.nvidia.com/jetson/common r32 InRelease [2,541 B]
Get:17
https://repo.switchroot.org unstable/ InRelease [1,631 B]
Get:19
https://repo.download.nvidia.com/jetson/t210 r32 InRelease [2,555 B]
Get:20
https://repo.switchroot.org unstable/ Packages [1,796 B]
Get:21
https://repo.download.nvidia.com/jetson/t210 r32/main arm64 Packages [8,084 B]
Fetched 16.6 kB in 4s (3,912 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
5 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Failed to fetch
http://turul.canonical.com/dists/bionic/InRelease 502 Connection refused [IP: 91.189.91.11 80]
W: Failed to fetch
http://turul.canonical.com/dists/bionic-updates/InRelease 502 Connection refused [IP: 91.189.91.11 80]
W: Failed to fetch
http://turul.canonical.com/dists/bionic-backports/InRelease 502 Connection refused [IP: 91.189.91.11 80]
W: Failed to fetch
http://turul.canonical.com/dists/bionic-security/InRelease 502 Connection refused [IP: 91.189.91.11 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.