/etc/apt/apt.conf.d/60icons-large-hidpi is in apt-config-icons-large-hidpi 0.12.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | ## This file enables the download of 128x128px icons
## suitable for HiDPI displays for use in software
## centers like GNOME Software and Plasma Discover.
Acquire::IndexTargets {
deb::DEP-11-icons-hidpi {
DefaultEnabled "true";
};
};
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