เกิดจาก การอัพเกรด 16.04Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
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apt-get dist-upgrade
ทางแก้
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cd /etc/apt/apt.conf.d
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sudo rm 50unattended-upgrades.ucf-old