[FS#1236] OPKG update error if updated already

[LEDE Bugs]

The following task has a new comment added:

FS#1236 - OPKG update error if updated already
User who did this - Yousong Zhou (yousong)

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Please show output of "free" command to check if the device is really out of memory!
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1236#comment4014