I created a private deb repository to spread a software and it's updates to 600 Ubuntu netbooks. Each time the network is connected, my script try to do a apt-get update.

But sometimes (quite often in fact), I have this : Failed to fetch https://myserver/ubuntu/dists/maverick/main/binary-i386/voosicomat.deb Size mismatch The server is an 2.2 Apache, HTTPS only. There is no error on it's logs.

Here is the script :

apt-get update
apt-get dist-upgrade --force-yes --yes

Here is the complete output of apt-get

Ign https://myserver maverick Release.gpg
Ign https://myserver/ubuntu/ maverick/main Translation-en
Ign https://myserver maverick Release
Ign https://myserver maverick/main i386 Packages/DiffIndex
Ign https://myserver maverick/main i386 Packages
Ign https://myserver maverick/main i386 Packages
Hit https://myserver maverick/main i386 Packages
Reading package lists...
Reading package lists...
Building dependency tree...
Reading state information...
The following packages will be upgraded:
  majdb utilitaires voosicomat
3 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 6207kB/6273kB of archives.
After this operation, 0B of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  utilitaires voosicomat majdb
Get:1 https://myserver/ubuntu/ maverick/main voosicomat all 2.0.1 [4755kB]
Get:2 https://myserver/ubuntu/ maverick/main majdb all 1.0.17 [1452kB]
Failed to fetch https://myserver/ubuntu/dists/maverick/main/binary-i386/voosicomat.deb  Size mismatch
Fetched 7091kB in 21s (324kB/s)
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Regards
Cédric