Доброго времени суток

# apt-get update
...
Получено: 2 https://repo.yandex.ru x86_64 release [1970B]
...
Получено 12,4kB за 0s (17,9kB/s).
...
Получено: 1 https://repo.yandex.ru x86_64/yandex-browser pkglist [3884B]
...
Получено 4040B за 0s (5814B/s).
E: Failed to fetch https://repo.yandex.ru/yandex-browser/alt/x86_64/base/pkglist.yandex-browser  Несовпадение размера
E: Some index files failed to download. They have been ignored, or old ones used instead.

[root@machenike ~]# rpm -qa | grep apt-conf-yandex-browser
apt-conf-yandex-browser-1.0-alt4.x86_64