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If you have more than a single source, then apt will already be checking this for you. The default is more than a single source.

• saagarjha 11mo ago
  All of mine point to like somethingsomething.ubuntu.com
  • shakna 11mo ago
    If it points to mirror.ubuntu.com, it'll be mirroring at host end, instead of inside apt. But as apt does do resolution to a list, it'll be fetching from multiple places at once.