how to define root system on ubuntu 21.04 for intallation

Asked by pat hoolahan

upon install of any version of ubuntu/lubuntu (on a kingston a400 series 240gb ssd) it shows all sda partitions. /dev/sda *etc. the problem i am experiencing is 'no root file system is defined' and 'please correct this from the partitioning menu'.
by all appearances it looks like it should work.
i just have no idea how to set this.

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actionparsnip (andrew-woodhead666) said :

Did you set one as the root file system? I'm guessing you used the "something else" option. You need to tell the installer to use a partition for "/" as this is the root file system.

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