Estou tentando atualizar wheezy para jessie e obter erros de origem duplicados
apt-get update
...
Reading package lists... Done
W: Duplicate sources.list entry http://ftp.uk.debian.org/debian/ jessie/main i386 Packages (/var/lib/apt/lists/ftp.uk.debian.org_debian_dists_jessie_main_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
O conteúdo de /etc/apt/sources.list é:
deb http://ftp.uk.debian.org/debian/ jessie main
#deb-src http://ftp.uk.debian.org/debian/ jessie main
deb http://security.debian.org/ jessie/updates main
#deb-src http://security.debian.org/ jessie/updates main
# jessie-updates, previously known as 'volatile'
deb http://ftp.uk.debian.org/debian/ jessie-updates main
#deb-src http://ftp.uk.debian.org/debian/ jessie-updates main
deb http://ftp.uk.debian.org/debian/ jessie main contrib non-free
#deb-src http://ftp.uk.debian.org/debian/ jessie main contrib non-free
O conteúdo de /var/lib/apt/lists/ é
ftp.uk.debian.org_debian_dists_jessie_contrib_binary-i386_Packages
ftp.uk.debian.org_debian_dists_jessie_contrib_i18n_Translation-en
ftp.uk.debian.org_debian_dists_jessie_main_binary-i386_Packages
ftp.uk.debian.org_debian_dists_jessie_main_i18n_Translation-en
ftp.uk.debian.org_debian_dists_jessie_non-free_binary-i386_Packages
ftp.uk.debian.org_debian_dists_jessie_non-free_i18n_Translation-en
ftp.uk.debian.org_debian_dists_jessie_Release
ftp.uk.debian.org_debian_dists_jessie_Release.gpg
ftp.uk.debian.org_debian_dists_jessie-updates_main_binary-i386_Packages
ftp.uk.debian.org_debian_dists_jessie-updates_main_binary-i386_Packages.IndexDiff
ftp.uk.debian.org_debian_dists_jessie-updates_main_i18n_Translation-en
ftp.uk.debian.org_debian_dists_jessie-updates_main_i18n_Translation-en.IndexDiff
ftp.uk.debian.org_debian_dists_jessie-updates_Release
ftp.uk.debian.org_debian_dists_jessie-updates_Release.gpg
lock
partial
security.debian.org_dists_jessie_updates_main_binary-i386_Packages
security.debian.org_dists_jessie_updates_main_i18n_Translation-en
security.debian.org_dists_jessie_updates_Release
security.debian.org_dists_jessie_updates_Release.gpg
Qualquer ajuda, por favor, sou novo nisso e não vejo onde estou indo errado.
A linha
deb http://ftp.uk.debian.org/debian/ jessie main contrib non-free
no seu /etc/apt/sources.list é uma duplicata / extensão de
deb http://ftp.uk.debian.org/debian/ jessie main
Exclua a linha mais curta.
Pelo menos em teoria, também poderia haver mais duplicações com linhas em /etc/apt/sources.list.d/* arquivos.