The Issue
As I screwed my linux install (the home folder is encrypted and through a series of unfortunate events, I know cannot decrypt it) I want to make another partition on the HDD and install linux mint to that partition, so I don't have to work from a live USB anymore. However, GParted won't resize the partition.
I Tried
I started GParted from the start menu, selected the prober hdd, and hit 'move/resize'. However, it says the minimum size is ~900 GB (almost the entire hard drive) even though there's only around 100GB used (which is what the file system shows me). Therefore, I can't decrease the partition size, even though it should be mostly empty.
I tried running GParted as root, to see if that helps, but the terminal gave the below response.
Code:
sudo gparted
======================
libparted : 2.3
======================
(gpartedbin:6758): GLib-CRITICAL **: Source ID 7 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 6 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 26 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 25 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 303 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 302 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 307 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 306 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 312 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 311 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 315 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 314 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 319 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 318 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 322 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 321 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 327 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 326 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 330 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 329 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 333 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 332 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 897 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 896 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 931 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 930 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1119 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1118 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1146 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1145 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1150 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1149 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1153 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1152 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1158 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1157 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1161 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1160 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1166 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1165 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1171 was not found when attempting to remove it
(gpartedbin:6758): GLib-CRITICAL **: Source ID 1170 was not found when attempting to remove it
I have tried to find a solution through DuckDuckGo, as well as the search on this forum, but I have been unsuccessful. The tutorials I find, all show the partition with unused space, but my GParted shows it is used almost entirely, with only 12 MiB unused.
Any help would be much appreciated, as I really don't want to format the entire HDD, because I still have hope of getting access to the encrypted folders which hold quite some files I can't easily replace (KeePass database, work-related stuff, research material and articles I wrote. There's many days of work in there).
relevant info
I'm running Linux Mint 17.2 on an external HDD, as my internal HD died months ago. It's the XFCE edition of Mint. I've been using Linux for around 6-8 months, so I have working knowledge of the terminal and most of the software on here, but I am not very familiar with the underlying workings of the OS.
Edit:
I just noticed the partition has an LVM flag. I imagine that could have something to do with it, but I don't know how this applies to the actions I have to undertake. I'll be looking for a solution and updating this question if I find anything. In the meantime, any help is still highly appreciated.
