This sounds like exactly the behaviour that I explained in 2013 here:
https://askubuntu.com/a/332421/7808
ifconfig still exists but is deprecated and no longer shipped by
default. Users should use its replacement "ip" instead.
However it is true that ifconfig does not display the additional alias
[Expired for net-tools (Ubuntu) because there has been no activity for
60 days.]
** Changed in: net-tools (Ubuntu)
Status: Incomplete => Expired
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: net-tools (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/878333
Title:
i
** Attachment added: "My /etc/network/interfaces file, used to configure the
virtual ip addresses"
https://bugs.launchpad.net/ubuntu/+source/net-tools/+bug/878333/+attachment/2560933/+files/interfaces
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** Attachment added: "Output of `ip addr show`"
https://bugs.launchpad.net/ubuntu/+source/net-tools/+bug/878333/+attachment/2560932/+files/output_ip_addr_show.txt
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** Attachment added: "The output of `ifconfig -a`"
https://bugs.launchpad.net/bugs/878333/+attachment/2560921/+files/output_ifconfig_-a.txt
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Tit
