如何修復印表機無法處理請求並陷入隊列的問題？

Question

我在 Oracle Linux 5.1 上運行。應用程式提交列印的作業正在進入列印佇列，但沒有被清除。如何解決這種情況？

$ lpstat -t
printer MATERIALSJD3 now printing MATERIALSJD3-7.  enabled since Mon 13 Nov 2017 03:26:37 PM MYT
MATERIALSJD3-1          appltest         10240   Mon 13 Nov 2017 03:26:37 PM MYT
MATERIALSJD3-2          appltest         10240   Mon 13 Nov 2017 03:29:35 PM MYT
MATERIALSJD3-3          appltest         10240   Tue 14 Nov 2017 08:52:15 AM MYT
MATERIALSJD3-4          appltest         10240   Wed 15 Nov 2017 12:50:46 PM MYT
MATERIALSJD3-5          appltest          7168   Thu 16 Nov 2017 03:09:38 PM MYT
MATERIALSJD3-6          appltest         10240   Fri 17 Nov 2017 09:09:11 AM MYT
MATERIALSJD3-7          appltest          7168   Fri 17 Nov 2017 03:47:19 PM MYT