在过去的两年里，我无法处理任何更改、更新或安装新软件，因为 Synaptic 包管理器存在重大问题，并且终端级别也出现了类似的情况。
我甚至无法更新或升级 Ubuntu。一切似乎都被以下错误阻止了：
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/www.iri.upc.edu_cuik_ubuntu_dists_xenial_main_binary-amd64_Packages
E: The package lists or status file could not be parsed or opened.
E: _cache->open() failed, please report.
W: Target Packages (partner/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:45 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Packages (partner/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:45 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Packages (partner/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:45 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Translations (partner/i18n/Translation-en_CA) is configured multiple times in /etc/apt/sources.list:45 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Translations (partner/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:45 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target DEP-11 (partner/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:45 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target DEP-11-icons (partner/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:45 and /etc/apt/sources.list.d/xenial-partner.list:4
我应该怎样做才能修复此问题？