更新debtap时发生错误，如何解决？
zhangsan@xxx]$ sudo debtap -u
==> Synchronizing pkgfile database...
:: Updating 5 repos...
archlinuxcn is up to date
community is up to date
core is up to date
extra is up to date
multilib is up to date
==> Synchronizing debtap database...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 11.7M 100 11.7M 0 0 417k 0 0:00:28 0:00:28 --:--:-- 806k
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 103k 100 103k 0 0 100k 0 0:00:01 0:00:01 --:--:-- 100k
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 67336 100 67336 0 0 47414 0 0:00:01 0:00:01 --:--:-- 47419
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- 0:00:01 --:--:-- 0
gzip: /var/cache/debtap/ubuntu-packages-files.gz: unexpected end of file
Synchronization failed. Exiting...