mount: you must specify the filesystem type

I want to mount a partition to an auxiliary folder via mount to fix a damaged grub.

I used the command.

sudo mount /dev/sdb2 /home/ubuntu/temp

and got as error:

mount: you must specify the filesystem type

Why?

You need to add the -t FILESYSTEMTYPE argument to the command, replacing FILESYSTEMTYPE with your filesystem type. This specifies the filesystem type of the filesystem to be mounted. In your case, this would be /dev/sdb2. Some common, valid filesystem types are:

• auto - this is a special one. It will try to guess the fs type when you use this.


• ext4 - this is probably the most common Linux fs type of the last few years


• ext3 - this is the most common Linux fs type from a couple years back


• ntfs - this is the most common Windows fs type or larger external hard drives


• vfat - this is the most common fs type used for smaller external hard drives


• exfat - is also a file system option commonly found on USB flash drives and other external drives