Как скачать dbgsym ядро ​​для 15.10?

У меня проблема с поиском ядра dbgsym из ww-репозиториев. К сожалению, я не могу его найти. Моя система падает при запуске вина и хром, и я пытаюсь прочитать свалку сбоев.

uname -r
4.2.0-25-generic

sudo apt-get install linux-image-$(uname -r)-dbgsym
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package linux-image-4.2.0-25-generic-dbgsym
E: Couldn't find any package by regex 'linux-image-4.2.0-25-generic-     dbgsym'

sudo apt-cache search generic-dbgsym | grep kernel
linux-image-4.2.0-22-generic-dbgsym - Linux kernel debug image for     version 4.2.0 on 64 bit x86 SMP
linux-image-4.2.0-19-generic-dbgsym - Linux kernel debug image for version 4.2.0 on 64 bit x86 SMP
linux-image-4.2.0-21-generic-dbgsym - Linux kernel debug image for version 4.2.0 on 64 bit x86 SMP
linux-image-4.2.0-18-generic-dbgsym - Linux kernel debug image for version 4.2.0 on 64 bit x86 SMP
linux-image-4.2.0-23-generic-dbgsym - Linux kernel debug image for version 4.2.0 on 64 bit x86 SMP
linux-image-4.2.0-24-generic-dbgsym - Linux kernel debug image for version 4.2.0 on 64 bit x86 SMP
linux-image-3.19.0-23-generic-dbgsym - Linux kernel debug image for version 3.19.0 on 64 bit x86 SMP

cat /etc/apt/sources.list.d/ddebs.list
deb http://ddebs.ubuntu.com/ wily main restricted universe multiverse
deb http://ddebs.ubuntu.com/ wily-security main restricted universe  multiverse
deb http://ddebs.ubuntu.com/ wily-updates main restricted universe multiverse
deb http://ddebs.ubuntu.com/ wily-proposed main restricted universe multiverse

Также я попытался очистить списки репо только в том случае, если что-то напуганное происходит там, но я все еще, кажется, получаю ошибки ниже. Я очистил их с помощью sudo-свойств-gtk

W:Failed to fetch http://ddebs.ubuntu.com/dists/wily-security/main/binary-amd64/Packages  404  Not Found
, W:Failed to fetch http://ddebs.ubuntu.com/dists/wily-security/restricted/binary-amd64/Packages  404  Not Found
, W:Failed to fetch http://ddebs.ubuntu.com/dists/wily-security/universe/binary-amd64/Packages  404  Not Found
, W:Failed to fetch http://ddebs.ubuntu.com/dists/wily-security/multiverse/binary-amd64/Packages  404  Not Found
, W:Failed to fetch http://ddebs.ubuntu.com/dists/wily-security/main/binary-i386/Packages  404  Not Found
, W:Failed to fetch http://ddebs.ubuntu.com/dists/wily-security/restricted/binary-i386/Packages  404  Not Found
, W:Failed to fetch http://ddebs.ubuntu.com/dists/wily-security/universe/binary-i386/Packages  404  Not Found
, W:Failed to fetch http://ddebs.ubuntu.com/dists/wily-security/multiverse/binary-i386/Packages  404  Not Found
, E:Some index files failed to download. They have been ignored, or old ones used instead.