มีบ้างครั้งเมื่อเรา apt-get update แล้วมีการ error ที่แจ้งว่า “failed to fetch”หรือเหมือนอย่างด้านล่าง
=====================================================
Err http://security.ubuntu.com precise-security Release.gpg
Unable to connect to security.ubuntu.com:http: [IP: 91.189.92.190 80]
Reading package lists... Done
W: Failed to fetch http://ph.archive.ubuntu.com/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ph.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease
W: Failed to fetch http://ph.archive.ubuntu.com/ubuntu/dists/precise-backports/InRelease
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/InRelease
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ph.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg Unable to connect to ph.archive.ubuntu.com:http: [IP: 91.189.92.177 80]
W: Failed to fetch http://ph.archive.ubuntu.com/ubuntu/dists/precise-updates/Release.gpg Unable to connect to ph.archive.ubuntu.com:http: [IP: 91.189.92.177 80]
W: Failed to fetch http://ph.archive.ubuntu.com/ubuntu/dists/precise-backports/Release.gpg Unable to connect to ph.archive.ubuntu.com:http: [IP: 91.189.92.177 80]
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release.gpg Unable to connect to extras.ubuntu.com:http:
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/Release.gpg Unable to connect to security.ubuntu.com:http: [IP: 91.189.92.190 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.