mssql-server: Depends on libjemalloc1 which is a virtual package and is not provided by any available package
I'm assuming you've followed the installation steps given on Microsoft's SQL server installation page right upto the point where you faced the error.
Here is a workaround:
- Download the latest version of libjemalloc (this one is for Ubuntu 18.04) from this mirror here - http://ftp.osuosl.org/pub/ubuntu/pool/universe/j/jemalloc/libjemalloc1_3.6.0-11_amd64.deb
- Install it:
sudo dpkg -i libjemalloc1_3.6.0-11_amd64.deb - Now run the apt command to install ms-sql server:
sudo apt-get install mssql-server
Hope this works for you.
I have found that MSSQL is also compatible with libjemalloc2. If you prefer to not install older packages, you can instead rebuild Microsoft's package with updated dependencies as outlined here: How do I install MS SQL for ubuntu 18.04 LTS?
Note that you will need to also run
sed -i -e 's#libjemalloc1#libjemalloc2#g' newpkg/DEBIAN/control
in step 4 to update the libjemalloc dependency so that it will work in Ubuntu 18.10.