When I try to install Ubuntu Server on a 150GB NTFS partition that I have on my hard drive, the installation will not allow me to continue. It will only continue if I mount it the filesystem at /. When I do this I get a warning saying that "Mounting an existing filesystem at / is usually a bad idea, proceed only with caution." Why do I get this warning? Should I continue with the installation, and if I shouldn't continue, is there a way to install without mounting at /.
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Although you could install Ubuntu into NTFS partition now, but it could require more work than with just installing it into linux partition. Better choose manual disk configuration. Remove your ntfs partition, create new partition with a file system supported by Ubuntu, Ext4 for example and make it mounted to /. Also, leave some place for swap partition.
On my machine I have been using Ubuntu since March 2019 and I have the next disk usage picture:
$ df -h | grep -v snap
Filesystem Size Used Avail Use% Mounted on
udev 7.8G 0 7.8G 0% /dev
tmpfs 1.6G 3.7M 1.6G 1% /run
/dev/sda2 177G 92G 76G 55% / <---------
tmpfs 7.8G 544M 7.3G 7% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/sdb1 229G 36G 181G 17% /home <------
tmpfs 1.6G 4.0K 1.6G 1% /run/user/130
tmpfs 1.6G 104K 1.6G 1% /run/user/1000
I don't know what you are going to do with your system. But if you want to use it only for short periods of time, I would recommend you to make your partition sizes as follow:
/ - 50 Gb
/home/ - 90 Gb, however, it depends on amount of RAM you have, number and weight of applications you consider to use
swap - residue
/home partition should no be formatted in case of further OS re-installation, so you will save your users' files. It's like a disk D: on Windows.
Gryu
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