não sei se foi isso exatamente, mas segue a saída.
igor@igor-Inspiron-5558:~$ sudo apt update
[sudo] password for igor:
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http://ppa.launchpad.net trusty InRelease [15,5 kB]
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http://sft.if.usp.br trusty-updates/main Sources [380 kB]
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http://ppa.launchpad.net trusty InRelease [15,5 kB]
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http://sft.if.usp.br trusty-updates/main amd64 Packages [887 kB]
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http://sft.if.usp.br trusty-updates/multiverse amd64 Packages [14,8 kB]
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http://sft.if.usp.br trusty-updates/main i386 Packages [849 kB]
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http://ppa.launchpad.net trusty/main amd64 Packages [34,4 kB]
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http://sft.if.usp.br trusty-updates/universe i386 Packages [372 kB]
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Obtidos 5.857 kB em 1min 21s (72,2 kB/s)
A ler as listas de pacotes... Pronto
W: Distribuição em conflito:
http://desktop-download.mendeley.com preview Release (esperado preview mas obtido stable)
Creto o mendley é um programa organizador de acervo de artigos. Usava no windows e vi que podia ser usado em linux. Acha que o problema é ele?