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/ directory is 100% full



Hello,

I am new to Debian. I have Wheezy installed on my Thinkpad x230 laptop. My kernel is 3.2.0-4-amd64.
The problem I am getting is that my "/" directory is 100% full. Because of this, I am unable to update my kernel as I get an insufficient space error. However, my hard disk has almost 300 GiB free.

When I tried to run lvxtend to expand the / directory, I get an "Insufficient free space: 256 extents needed, but only 0 available" error. The filesystem is ext4 and I am using an encrypted LVM.
Some more detail can be found in these outputs:

The problem:

root@debian:/# lvextend -L +1G /dev/mapper/debian-root
  Incorrect metadata area header checksum on /dev/sda1 at offset 4096
  Extending logical volume root to 1.32 GiB
  Insufficient free space: 256 extents needed, but only 0 available

Some tests:

root@debian:/# df -h
Filesystem               Size  Used Avail Use% Mounted on
rootfs                   322M  321M     0 100% /
udev                      10M     0   10M   0% /dev
tmpfs                    367M  816K  366M   1% /run
/dev/mapper/debian-root  322M  321M     0 100% /
tmpfs                    5.0M     0  5.0M   0% /run/lock
tmpfs                    734M   84K  734M   1% /run/shm
/dev/sda1                228M   19M  197M   9% /boot
/dev/mapper/debian-home  275G   59G  203G  23% /home
/dev/mapper/debian-tmp   368M   11M  339M   3% /tmp
/dev/mapper/debian-usr   8.3G  5.3G  2.6G  68% /usr
/dev/mapper/debian-var   2.8G  679M  2.0G  26% /var


root@debian:/# pvdisplay
  Incorrect metadata area header checksum on /dev/sda1 at offset 4096
  --- Physical volume ---
  PV Name               /dev/dm-0
  VG Name               debian
  PV Size               297.85 GiB / not usable 2.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              76249
  Free PE               0
  Allocated PE          76249
  PV UUID               NKMEex-9pcW-QMSi-dKEX-5XOI-nBXc-glrtNz
  
  "/dev/sda1" is a new physical volume of "243.00 MiB"
  --- NEW Physical volume ---
  PV Name               /dev/sda1
  VG Name              
  PV Size               243.00 MiB
  Allocatable           NO
  PE Size               0  
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               a1KkXm-XB4C-o5SH-jnHz-BdZJ-u8v3-LscZ7W


root@debian:/# mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,relatime,size=10240k,nr_inodes=467547,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=375388k,mode=755)
/dev/mapper/debian-root on / type ext4 (rw,relatime,errors=remount-ro,user_xattr,barrier=1,stripe=4,data="">tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /run/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=750760k)
/dev/sda1 on /boot type ext2 (rw,relatime,errors=continue)
/dev/mapper/debian-home on /home type ext4 (rw,relatime,user_xattr,barrier=1,data="">/dev/mapper/debian-tmp on /tmp type ext4 (rw,relatime,user_xattr,barrier=1,stripe=4,data="">/dev/mapper/debian-usr on /usr type ext4 (rw,relatime,user_xattr,barrier=1,data="">/dev/mapper/debian-var on /var type ext4 (rw,relatime,user_xattr,barrier=1,data="">rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,nosuid,nodev,noexec,relatime)

The problem appears to be the "Free PE     0" from some research that I did online. I want to know how I can fix this issue so that I can then use lvextend to increase the size of the root directory. What is a recommended value for the size of this directory? I used the defaults suggested by the partition manager during installation, but it is clearly insufficient as seen above. Any help would be appreciated.

Thanks,
Sumant

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