Problemas com atualizacao

Acabei de instalar o Manjaro, mas quando eu tento atualizar comeca a dar varios erros durante o upgrade:

sudo pacman -Syyuu

error: failed retrieving file 'core.db' from linorg.usp.br : Failed writing body (1200 != 1448)00:00 [------------------------------------------------------------] 0%
error: failed retrieving file 'core.db' from manjaro.dcc.uchile.cl : Failed writing body (225 != 1368)------------------------------------------------------------] 0%
error: failed retrieving file 'core.db' from mirror.bjtu.edu.cn : Failed writing body (69 != 1428)00 [------------------------------------------------------------] 0%
error: failed retrieving file 'core.db' from www.mirrorservice.org : Failed writing body (1408 != 1448)-----------------------------------------------------------] 0%
error: failed retrieving file 'core.db' from ftp.halifax.rwth-aachen.de : Failed writing body (45 != 1428)--------------------------------------------------------] 0%
error: failed retrieving file 'core.db' from ftp.linux.org.tr : Failed writing body (56 != 1428)0:00 [------------------------------------------------------------] 0%
error: failed retrieving file 'core.db' from mirror.netcologne.de : Failed writing body (70 != 1428) [------------------------------------------------------------] 0%
error: failed retrieving file 'core.db' from ftp.cuhk.edu.hk : Failed writing body (38 != 1428)00:24 [##----------------------------------------------------------] 4%
error: failed retrieving file 'core.db' from mirror.solarvps.com : Failed writing body (1408 != 2896)[------------------------------------------------------------] 0%
error: failed retrieving file 'core.db' from ftp.dei.uc.pt : Failed writing body (1428 != 1448)00:00 [------------


Como resolver?

Hoje eu instalei manjaro-15.12-xfce e tbem não consegui instalar nada nele
Dava mensagem de erro conexão
Acabei voltando Ubuntu-14.04-lts

Tente mudar para outro repositório em /etc/pacman.d/mirrorlist.
--
LinuxCounter: #596371

Como faz isso?
sou novo na familia Arch e Rolling release.

Ver Open the Mirrorlist em:
https://wiki.manjaro.org/index.php?title=Change_to_a_Different_Download_Server
--
LinuxCounter: #596371

O erro persiste, mudei a mirrorlist mas ainda n possui coneccao. Estou com internet.