“Insufficient storage available” related

Fastest/easy way to move ALL apps back to [original] internal storage/memory prior to changing/formatting:
Multi-select \ Select all \ Move to phone (and/or Remove Link?)
NOTE:
Uninstalling Link2SD will NOT do the trick (see FAQ: What happens to my linked apps if I uninstall the Link2SD app?)

Free up /system storage
Q: Looking at the storage info within Link2SD I see that I only have 2% of my /system storage free
A:
removing system apps will NOT give you anymore user available space, but integrating updates of system app will, link2sd can [do] this now. Low "/system" storage should not give you any problems since items in there are pretty much static

Better not upgrade to KitKat if still want to use Link2SD
Note from Link2SD 3.5.2 version (click "View page source" on "Reviews" section):
KITKAT NOTICE In Android KitKat is not legally possible to write files to any location on external SD card. So the functionality of the app limits to internal storage on KitKat. If you have a rooted device you can try a fix: https://play.google.com/store/apps/details?id=nextapp.sdfix
*UPDATE Jan 8, 2015 Found this:
Unlock external SD Card writing for all apps in Android 4.4 KitKat
Comment by SonicX (search string "Link2SD") might be useful; never tried it though

Link2SD - missing apps after reboot
Posted on Nov 13, 2014:
The "Link Internal Data" option in the paid version seems to be the culprit. This is buggy and stopped using it after a few apps disappeared after using this option.
Another suggestion from this:
Start link2sd and click menu button>more>quickreboot and all the "missing apps" are going to be available again for all your needs!

Increase internal memory in Android Mobiles in easy steps

Is it safe to resize 2nd partition (ext2) used by Link2SD after some time?

seriously to say i wouldn't recommend to restore that ext partition.. As you are saying you want to restore your config of Link2sd.. Well to say it will not work cz the system links get disturbed due to removal of partition or modify..
well best to say i would recommend to take a backup of your ROM then partition the card..
Well to say i would recommend to you first switch off your phone.. Put it in card reader then partition it..
Restore the backup then see if it works.. I think you are on stock rom..

You can try this method:
1. Make a backup of your current ROM Using the recovery..
2. Switch off the phone then put it in card reader.. Re partition your card using card reader..
3. Then restore the backup..
See if this works..
source: Extend EXT2 partition without losing data
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Link2SD: mount script created but link2sd.log says "No such file..." or "Device or resource busy"
(NOT TRIED YET) Problem with link2sd

Important topics from Link2SD FAQ
You need to use a non-FAT file system (ext2, ext3, ext4 or f2fs) on your second partition in order to link app's private data files. Because the FAT file system (FAT16, FAT32 or exFAT) does not support UNIX file ownership or permissions and will cause a security breakdown of app's private files. Link2SD Plus can move app's private data files if you have a non-FAT partition.
What is the difference between “Move To SD Card (Native to Android)" and “Create (Symbolic) Link” in Link2SD?
Click "Create Link":
..move and link applications to 2nd partition with Link2SD.
..You can see "Linked -> SD card" label for linked apps
click "Move to SD":
..app will be moved to first partition with native app2sd method of Android OS.
..You can see "on SD Card" label for those apps
What does it mean to freeze an app - what is the benefit of doing that?
 I see -Updated- label on some applications, what does it mean?

“Insufficient Storage Available” even there is lot of free space in device memory
Dial *#9900# (for Samsung only?)
see rhlee's answer for how to do the same thing if you get the "invalid MMI" error when you try this on a rooted, modded phone.
Basically, Delete dumpstate/logcat in SysDump clears out the log files in /data/log. But you can also do this manually without SysDump
...

Increase Internal Storage of Micromax A110 and any MTK Device

'Insufficient Storage Available' is one of Android's greatest annoyances. Here's how to fix it.
You can get a big-picture look at what is using up your internal and external space by installing DiskUsage, a free app that visualizes what's sitting around in storage.
Self experience: Cache of Download Manager

“Insufficient storage available”. Ok, but where?

Related
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[GUIDE] [FAT32] [EXT4] [SWAP] [2.3+] How to Partition your Android MicroSD Card