我在我的 debian/testing 系统上运行了 apt-get upgrade，现在我得到了上面的错误。我怎样才能解决这个问题？外壳记录如下：
136 upgraded, 0 newly installed, 0 to remove and 40 not upgraded.
1 not fully installed or removed.
Need to get 182kB/143MB of archives.
After this operation, 3671kB disk space will be freed.
Do you want to continue [Y/n]?
Get:1 http://ftp.us.debian.org testing/main libtiff4 3.9.4-3 [182kB]
Fetched 182kB in 0s (318kB/s)
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another p
rocess: Resource temporarily unavailable
Setting up sysv-rc (2.88dsf-12) ...
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by …debian ×1