syahril@syahril-Aspire-S3 ~ $ apt-get update Reading package lists... Done W: chmod 0700 of directory /var/lib/apt/lists/partial failed - SetupAPTPartialDirectory (1: Operation not permitted) E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied) E: Unable to lock directory /var/lib/apt/lists/ W: Problem unlinking the file /var/cache/apt/pkgcache.bin - RemoveCaches (13: Permission denied) W: Problem unlinking the file /var/cache/apt/srcpkgcache.bin - RemoveCaches (13: Permission denied) syahril@syahril-Aspire-S3 ~ $ apt-get install filezilla -y E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied) E: Unable to lock the administration directory (/var/lib/dpkg/), are you root? syahril@syahril-Aspire-S3 ~ $

Then no problem in increasing the size without unmount or any action. Use lvextend commnad and extend as required.