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https://comeandtechit.wordpress.com/2018/04/30/font-t1-cmr-m-n-10ecrm1000-at-10-0pt-not-loadable-metric-tfm-file-not-found-on-debian-9-4/
Font T1/cmr/m/n/10=ecrm1000 at 10.0pt not loadable: Metric (TFM) file not found on Debian 9.4