Ubuntu 更新错误？

Question

W: Some index files failed to download. They have been ignored, or old ones used instead.
E: Write error - write (28: No space left on device)
E: IO Error saving source cache
E: The package lists or status file could not be parsed or opened.

我想升级系统，更新软件时出错，可以继续升级系统吗？ 16升级到18

    df -Th | grep -v fs
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/xvda1     ext4       97G   97G     0 100% /