Intel Modelsim launch error on Centos 7 - Intel Modelsim launch error on Centos 7 Hello, I have installed Quartus Prime Pro 17.1.0 on my PC having Centos7 as an OS. However, when I try to launch modelsim using vsim command I get the following error message: Failed to obtain lock: couldn't open "/root/.modelsim_lock": file already exists Error in startup script: Initialization problem, exiting. Initialization problem, exiting. Initialization problem, exiting. while executing "Transcript::action_log "PROPREAD \"$key\" \"$value\""" (procedure "VsimProperties::Init" line 59) invoked from within "VsimProperties::Init $MTIKeypath" (procedure "PropertiesInit" line 18) invoked from within "PropertiesInit" invoked from within "ncFyP12 -+" (file "/mtitcl/vsim/vsim" line 1) ** Fatal: Read failure in vlm process (0,0) I have the following configuration: Quartus version: 17.1.0 OS : centos-release-7-9.2009.1.el7.centos.x86_64 Thank you. Lotfi Replies: Re: Intel Modelsim launch error on Centos 7 Hi, Glad your problem has been resolved. I now transition this thread to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you. Regards, Nurina P/S: If you like my comment, feel free to give Kudos. If my comment solved your problem, feel free to accept my comment as solution! Replies: Re: Intel Modelsim launch error on Centos 7 Hello, Thank you for your response. Actually, I installed Modelsim with Quartus Pro 20.3 and the above error disappeared. I think that the libraries were correctly installed this time. Lotfi. Replies: Re: Intel Modelsim launch error on Centos 7 Hi Lotfi, Any updates? Nurina Replies: Re: Intel Modelsim launch error on Centos 7 Hi Lotfi, You received that error because of missing libraries. Unfortunately we have no proper workaround as CentOS 7 is not supported on ModelSim Intel FPGA: https://www.intel.com/content/www/us/en/programmable/support/support-resources/download/os-support.html You could try installing the equivalent or substitute packages listed for Red Hat Enterprise Linux from Table 2 of this document: https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/manual/quartus_install.pdf#page=8 Otherwise you'd have to use a different EDA simulation tool that supports CentOS 7. Sorry for the inconvenience. Regards, Nurina