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受到Beqa Arabuli和fossfreedom的鼓励，我的评论变成了答案。我首先在评论中发布了解决方案，但是bigbadonk420只是给出了类似的答案。但是，由于最初是我的想法，因此在这里提出另一个答案是合理的。

It is most likely not an Ubuntu problem as you have changed browsers, reinstalled the OS and done everything that could reasonably be done. The fact that your ping to profile.ak.fbcdn.net is idle means that your are not resolving the address at all (the ping is not being silently blocked as I can ping it successfully). This means that it is probably a dns related issue; you can resolve facebook.com, but not all its content delivery networks (cdns).

That is why other internet sites are fine, but facebook is affected; there must be some kind of misconfiguration in your isp's dns records, or they are blocking the Facebook cdn for some reason. If they are using a transparent proxy perhaps the facebook cdns are getting swept up with that. Anyway, it is impossible to know the exact reason without contacting your isp.

However, the best thing to do is to try an alternative dns; there are several alternatives, but probably the best is Google dns. More information is available from here; you need to set your primary dns as 8.8.8.8 and your secondary as 8.8.4.4 in your Ubuntu network settings and then reboot. You must make sure that your dns is not automatically being set to your original isp's dns. There are more instructions here relating to the setup of Google dns, but it is straightforward and should allow you to solve your problem without contacting your isp.

转到network-manager>选择您的连接>单击编辑，然后选择ipv4标签（如果您像大多数人一样使用ipv4）。屏幕截图如下：更改automatic dhcp为，automatic (DHCP) addresses only然后在提供的框中输入dns详细信息：