Проблема сохраняется:

```
$ apt-config dump | grep Proxy
$ apt-repo 
rpm  http://autoports.altlinux.org/pub ALTLinux/autoports/p10/x86_64 autoports
rpm  http://autoports.altlinux.org/pub ALTLinux/autoports/p10/noarch autoports
rpm [p10] http://ftp.altlinux.org/pub/distributions/ALTLinux p10/branch/x86_64 classic
rpm [p10] http://ftp.altlinux.org/pub/distributions/ALTLinux p10/branch/x86_64-i586 classic
rpm [p10] http://ftp.altlinux.org/pub/distributions/ALTLinux p10/branch/noarch classic
# apt-get update
Get:1 http://ftp.altlinux.org p10/branch/x86_64 release [4223B]
Get:2 http://ftp.altlinux.org p10/branch/x86_64-i586 release [1665B] 
Get:3 http://ftp.altlinux.org p10/branch/noarch release [2844B] 
Get:4 http://autoports.altlinux.org ALTLinux/autoports/p10/x86_64 release [1993B]
Get:5 http://autoports.altlinux.org ALTLinux/autoports/p10/noarch release [1991B]
Fetched 12.7kB in 0s (167kB/s)                
Hit http://ftp.altlinux.org p10/branch/x86_64/classic pkglist
Hit http://ftp.altlinux.org p10/branch/x86_64/classic release
Hit http://ftp.altlinux.org p10/branch/x86_64-i586/classic pkglist
Hit http://ftp.altlinux.org p10/branch/x86_64-i586/classic release
Hit http://ftp.altlinux.org p10/branch/noarch/classic pkglist
Hit http://ftp.altlinux.org p10/branch/noarch/classic release
Get:1 http://autoports.altlinux.org ALTLinux/autoports/p10/x86_64/autoports pkglist [4364kB]
Get:2 http://autoports.altlinux.org ALTLinux/autoports/p10/x86_64/autoports release
Hit http://autoports.altlinux.org ALTLinux/autoports/p10/noarch/autoports pkglist
Hit http://autoports.altlinux.org ALTLinux/autoports/p10/noarch/autoports release
Fetched 1B in 0s (1B/s)                   
E: Failed to fetch http://autoports.altlinux.org/pub/ALTLinux/autoports/p10/x86_64/base/pkglist.autoports  Size mismatch
E: Failed to fetch http://autoports.altlinux.org/pub/ALTLinux/autoports/p10/x86_64/base/release.autoports  Size mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.
```

Можете ли подтвердить проблему?
Когда планируется исправление?

(Ответ для Nikolay Strelkov на комментарий #1)

> ```
> 
> Можете ли подтвердить проблему?
Могу:
# apt-get update
Получено: 1 http://altlinuxclub.ru x86_64 release [1733B]
Получено: 2 http://autoports.altlinux.org noarch release [1991B]  
Ошибка http://autoports.altlinux.org noarch release
  File was not signed with a known key. Check if the proper gpg key was imported to your keyring.
Получено: 3 ftp://ftp.altlinux.org p10/branch/x86_64 release [4223B]
Получено: 4 ftp://ftp.altlinux.org p10/branch/x86_64-i586 release [1665B]
Получено: 5 ftp://ftp.altlinux.org p10/branch/noarch release [2844B]
Получено 10,5kB за 2s (4383B/s).
W: Release files for some repositories could not be retrieved or authenticated. Such repositories are being ignored.
E: Failed to fetch http://autoports.altlinux.org/pub/ALTLinux/autoports/p10/noarch/base/release  File was not signed with a known key. Check if the proper gpg key was imported to your keyring.
E: Some index files failed to download. They have been ignored, or old ones used instead.
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object
E: Tried to dequeue a fetching object

> Когда планируется исправление?
С мэйнтейнером не удаётся связаться...