Aptitude says the following:
┌──────────────────────────────────────────────────────────────────────────────┐
│W: Target Contents-deb-legacy (Contents-i386) is configured multiple times in▒│
│ /etc/apt/sources.list:4 and /etc/apt/sources.list:10 ▒│
│W: Target Contents-deb-legacy (Contents-all) is configured multiple times in ▒│
│ /etc/apt/sources.list:4 and /etc/apt/sources.list:10 ▒│
│W: Target Contents-deb-legacy (Contents-i386) is configured multiple times in▒│
│ /etc/apt/sources.list:4 and /etc/apt/sources.list:13 ▒│
│W: Target Contents-deb-legacy (Contents-all) is configured multiple times in ▒│
│ /etc/apt/sources.list:4 and /etc/apt/sources.list:13 ▒│
│ [ Ok ] │
└──────────────────────────────────────────────────────────────────────────────┘
Aptitude says the following: ─────── ─────── ─────── ─────── ─────── ─────── ─────── ─────── ─────── ─────── ──┐ sources. list:4 and /etc/apt/ sources. list:10 ▒│ sources. list:4 and /etc/apt/ sources. list:10 ▒│ sources. list:4 and /etc/apt/ sources. list:13 ▒│ sources. list:4 and /etc/apt/ sources. list:13 ▒│ ─────── ─────── ─────── ─────── ─────── ─────── ─────── ─────── ─────── ─────── ──┘
┌──────
│W: Target Contents-deb-legacy (Contents-i386) is configured multiple times in▒│
│ /etc/apt/
│W: Target Contents-deb-legacy (Contents-all) is configured multiple times in ▒│
│ /etc/apt/
│W: Target Contents-deb-legacy (Contents-i386) is configured multiple times in▒│
│ /etc/apt/
│W: Target Contents-deb-legacy (Contents-all) is configured multiple times in ▒│
│ /etc/apt/
│ [ Ok ] │
└──────
I did not touch /etc/sources.list.
This messages prevent normal use of aptitude.